Which is better for gaming, the C5 or the C6?

The C6 edges ahead with a 165Hz VRR ceiling versus 144Hz on the C5, plus QMS and QFT. Both have four HDMI 2.1 ports, sub-0.1ms response and ALLM, so console gamers will be happy with either.

Is the C6 worth stepping up to over the C5?

Step up if you want the newest Alpha 11 Gen3 processing, the higher refresh ceiling and the 2.2-channel 40W speakers. If you mainly watch film and streaming content, the C5's Alpha 9 Gen8 picture is close and has far more owner feedback behind it.

Which has better built-in sound?

The C6. Its 2.2-channel 40W speaker system is a clear step above the C5's standard speakers. Neither replaces a soundbar for serious home theater, but the C6 is stronger out of the box.

Do both support Dolby Vision and Dolby Atmos?

Yes. The C5 lists Dolby Vision, HDR10 and HLG plus Dolby Atmos, and the C6 carries LG's Dolby Vision and Atmos support. HDR handling is effectively equal between them.

There is no reliable longevity data separating them. The C5 has a much larger owner base reporting 4.8, while the C6 is too new for long-term reports. Both use LG OLED panels with the same burn-in considerations.

Which is better in a bright room?

Both are OLED evo sets with anti-glare treatment on the C5 and Bright Room Ready claims on the C6. The C6's newer processor targets brightness handling, but neither matches a high-end Mini LED in a sunlit room.

LG C5 Series OLED evo 4K TV vs LG C6 OLED 77" 4K Smart TV

Both are 77-inch LG OLED evo 4K sets, so the picture fundamentals are close: perfect blacks, wide viewing angles, Dolby Vision and four HDMI 2.1 ports. The C5 is the 2025 model with the Alpha 9 Gen8 chip, a 144Hz VRR ceiling and a large, well-established owner base rating it 4.8. The C6 is the 2026 model with the newer Alpha 11 Gen3 processor, a 165Hz VRR ceiling, a 2.2-channel 40W speaker system and Wi-Fi 5. Buy the C6 if you want the newest processing and the higher refresh headroom; buy the C5 if you want the proven set with far more owner feedback.

Choose the LG C5 if you want the 2025 OLED evo with a long track record, 144Hz VRR and the Alpha 9 Gen8 processor.
Choose the LG C6 if you want the 2026 model with the Alpha 11 Gen3 chip, 165Hz VRR and a 2.2-channel 40W speaker system.

Prices

LG C5 Series OLED evo 4K TV: $1,680.25 at Walmart (checked today)