Samsung Q8F QLED vs LG B5 OLED: Which 65" TV Should You Buy in 2025?

When shopping for a premium 65" TV, you're entering the most competitive segment of the display market. This size hits the sweet spot for most living rooms—large enough for cinematic impact without overwhelming your space. But choosing between technologies can feel overwhelming, especially when comparing fundamentally different approaches like the Samsung Q8F QLED and LG B5 OLED.

At the time of writing, these TVs represent two distinct philosophies separated by roughly $200, with the Samsung Q8F positioned as the more affordable option. That price difference isn't arbitrary—it reflects genuinely different strengths and ideal use cases that we'll explore in detail.

Understanding QLED vs OLED: Two Roads to Great Pictures

The Samsung Approach: Quantum Dot Brightness

The Samsung Q8F uses Quantum Dot Light Emitting Diode (QLED) technology, which sounds more complicated than it actually is. Think of it as a sophisticated backlighting system where blue LED lights shine through a layer of microscopic quantum dots—tiny crystals that convert that blue light into precise red and green wavelengths. This creates incredibly pure, saturated colors while achieving brightness levels that can compete with sunlight streaming through your windows.

Samsung pairs this with mini-LED backlighting, meaning thousands of tiny LEDs can dim independently across different zones of the screen. While not as precise as OLED's pixel-level control, this local dimming dramatically improves contrast compared to traditional LED TVs. The Q4 AI Processor analyzes each scene in real-time, adjusting brightness, color, and sharpness based on what you're watching.

The LG Approach: Self-Lit Perfection

The LG B5 takes a radically different approach with Organic Light Emitting Diode (OLED) technology. Instead of using a backlight, each pixel generates its own light—and crucially, can turn completely off. This means perfect blacks: when the TV displays a black pixel, it produces literally zero light from that spot. It's the difference between shining a flashlight through black paint (LED/QLED) versus having no flashlight at all in that area (OLED).

LG's α8 AI Processor 4K Gen2 manages this pixel-level precision while upscaling lower-resolution content and optimizing HDR performance. The processor is notably faster than previous generations, enabling more sophisticated real-time adjustments to both picture and sound.

Performance Where It Matters Most

Brightness and Room Environment: The Great Divide

This is where these TVs diverge most dramatically. Based on our research of professional measurements and user experiences, the Samsung Q8F achieves peak HDR brightness around 1,100 nits—bright enough that HDR highlights genuinely pop even with afternoon sunlight in the room. More importantly, its fullscreen brightness capability means the entire image stays vibrant and punchy under ambient light.

The LG B5, by contrast, peaks around 670 nits and manages only about 130 nits across a full white screen. In a dark room, this doesn't matter—the perfect blacks create stunning contrast. But with windows or overhead lights, the B5 can look washed out and lose the visual impact that makes OLED special.

I've experienced this personally with OLED TVs in bright rooms. The technology that looks magical at night can feel disappointing during daytime viewing, especially with HDR content that relies on bright highlights for impact.

Contrast and Black Level Performance

Here's where the LG B5 absolutely dominates. When displaying a black pixel, it produces zero measurable light—creating infinite contrast ratios that no LED-based TV can match. In dark scenes, this translates to incredible depth and detail in shadows without the grey wash that affects even the best QLED displays.

The Samsung Q8F, despite its mini-LED local dimming, still shows slightly raised black levels. In a completely dark room, blacks appear more like dark grey with a subtle pink or blue tint. This isn't necessarily bad—most viewers find the overall bright, punchy image satisfying—but it's a fundamental limitation of the backlighting approach.

Expert reviews consistently highlight this as OLED's defining advantage. The visual depth created by perfect blacks makes movies feel more three-dimensional and immersive, particularly in dark viewing environments.

Color Accuracy and Gamut

Both TVs excel here, but in different ways. The LG B5 achieves approximately 99.5% of the DCI-P3 color gamut used in professional film production, with exceptional out-of-the-box accuracy. This means colors appear as filmmakers intended without professional calibration.

The Samsung Q8F reaches about 93% DCI-P3 but compensates with Quantum Dot technology's ability to maintain color saturation at high brightness levels. While slightly less accurate in absolute terms, many viewers prefer Samsung's more vibrant, punchy color presentation.

Gaming Performance: Speed vs. Brightness

For gaming, the LG B5 offers measurable advantages. Its sub-0.1ms response time means virtually no motion blur or ghosting in fast-paced games. Each pixel changes state instantaneously, creating incredibly smooth motion that competitive gamers appreciate.

Both TVs support Variable Refresh Rate (VRR), which synchronizes the TV's refresh rate with your gaming console to eliminate screen tearing, and Auto Low Latency Mode (ALLM), which automatically switches to gaming-optimized settings. The LG B5 provides all these features across all four HDMI 2.1 ports, ensuring maximum flexibility for multiple gaming devices.

The Samsung Q8F offers solid gaming performance but can't match OLED's response times. However, its higher brightness can make HDR games more impactful, particularly in well-lit gaming setups.

Smart TV Platforms and Features

LG's webOS 25: AI-Powered Simplicity

The LG B5 runs webOS 25, LG's latest smart TV platform that emphasizes AI-driven personalization. Quick Cards let you organize favorite apps into custom categories, while AI recommendations learn your viewing habits to suggest relevant content. The platform provides access to over 300 free channels through LG Channels, though availability varies by region.

The redesigned Magic Remote includes a dedicated AI button for voice commands and smart features. This AI integration extends to picture and sound optimization, automatically adjusting settings based on content type and viewing environment.

Samsung's Tizen: Smart Home Integration

The Samsung Q8F runs Tizen OS with Samsung Vision AI, focusing heavily on smart home integration. The TV can act as a SmartThings Hub, controlling compatible smart home devices directly. This ecosystem approach appeals to users already invested in Samsung devices or those wanting centralized smart home control.

Samsung TV Plus provides free streaming content, while Bixby voice assistant offers hands-free control. The platform's strength lies in its connectivity features, including seamless integration with Samsung phones and tablets.

Audio Considerations

Neither TV excels in built-in audio, which is typical for thin modern displays. The LG B5 includes a 20W 2.0 channel system with Dolby Atmos processing, while the Samsung Q8F features Object Tracking Sound Lite technology that attempts to match audio direction with on-screen action.

Both TVs support eARC (Enhanced Audio Return Channel) for high-quality audio passthrough to soundbars or AV receivers. Samsung's Q-Symphony technology allows compatible soundbars to work alongside the TV's speakers for enhanced sound, while LG focuses on clean passthrough to external audio systems.

For serious home theater use, plan to invest in a dedicated sound system regardless of which TV you choose.

Home Theater Considerations

For dedicated home theater setups with controlled lighting, the LG B5 is generally the superior choice. Its perfect blacks and infinite contrast create the immersive experience that makes big-screen viewing special. FILMMAKER MODE preserves director's intent by disabling motion smoothing and color enhancement, ensuring movies appear as intended.

However, the Samsung Q8F shouldn't be dismissed for home theater use. Its superior brightness can actually enhance the HDR experience with certain content, and its excellent reflection handling means you don't need blackout curtains for daytime viewing.

Reliability and Longevity

OLED technology has historically raised concerns about burn-in—permanent image retention from static elements like channel logos or gaming interfaces. Modern OLEDs like the LG B5 include sophisticated burn-in prevention features, including pixel shifting and automatic brightness reduction for static elements.

QLED technology doesn't suffer from burn-in concerns, potentially making the Samsung Q8F more suitable for users who frequently display static content or use the TV as a computer monitor.

Making Your Decision

Choose the Samsung Q8F QLED if:

Your viewing room has significant ambient light. Windows, overhead lights, or bright decor make the Q8F's superior brightness essential for maintaining image quality throughout the day.

Budget is a primary concern. The roughly $200 savings at the time of writing represents meaningful value, especially when the Q8F's brightness advantage suits your environment better anyway.

You prioritize reliability and longevity. QLED technology's freedom from burn-in concerns provides peace of mind for varied usage patterns.

Smart home integration matters. Samsung's ecosystem approach and SmartThings Hub functionality add practical value beyond just watching TV.

Choose the LG B5 OLED if:

You can control your viewing environment. Dark or dim rooms let OLED's contrast advantages shine, creating a genuinely superior viewing experience.

Picture quality is your absolute priority. If you're willing to optimize your room setup for the best possible image, OLED delivers unmatched contrast and color accuracy.

Gaming performance matters most. The sub-0.1ms response time provides measurable advantages for competitive gaming.

You primarily watch premium content. Movies, high-end streaming shows, and content mastered for wide color gamuts benefit most from OLED's capabilities.

The Bottom Line

Both the Samsung Q8F and LG B5 represent excellent values in their respective approaches to premium TV technology. The key is honestly assessing your viewing environment and priorities.

If I had to choose, I'd lean toward the Samsung Q8F for most buyers. Its superior brightness and reflection handling make it more versatile for real-world living spaces, while the cost savings could fund a quality soundbar that would improve the experience more than the B5's picture quality advantages in bright rooms.

However, for dark room enthusiasts or those building dedicated home theaters, the LG B5 delivers an experience that's genuinely different—not just better in measurable ways, but visually striking in a way that bright TVs simply cannot match.

The choice ultimately comes down to where and how you watch TV most often. Be honest about your room's lighting, your budget, and your priorities. Both TVs will serve you well, but in notably different circumstances.

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