Which is better for a dark room?

The LG C6. OLED pixels turn off completely, so black scenes stay black with no backlight glow. The QNED85's Mini LED zones still bleed light around bright objects in a dark room.

Which is better for a bright, sunny room?

The QNED85. Its Mini LED backlight pushes higher brightness to fight glare and reflections. The C6 is dimmer and can look washed out in direct sunlight.

Which is better for gaming?

The C6. Its 0.1ms response and 120Hz panel give cleaner motion with less blur. The QNED85 also supports 4K 120Hz, VRR and ALLM on all four HDMI ports, so it is a solid second choice.

Both should run for years. OLED panels can develop image retention from static logos or news tickers over time, so vary content. LED backlights do not have that risk but can develop uneven backlight zones.

Is the C6 worth stepping up to over the QNED85?

Yes, if picture quality matters most. The C6 adds OLED contrast, a faster processor, better speakers and newer webOS. Skip it if your room is very bright or you need a size other than 65 inches.

Do both support the same streaming apps and voice assistants?

Yes. Both run webOS and support Netflix, Prime Video, YouTube, Disney+ and HBO, plus Google Assistant, Alexa and Siri. The C6 ships with the newer webOS 26.

LG C6 Series OLED TV (65") vs LG QNED85 Mini LED 4K TV

The LG C6 is the better TV for picture quality. Its OLED panel gives true blacks and near-instant pixel response, and owners and reviewers consistently rate it highly. The QNED85 is a Mini LED set that gets brighter and comes in more sizes, but it cannot match OLED contrast. Buy the C6 for movies, dark rooms and gaming. Buy the QNED85 if you watch in a bright room or want a size other than 65 inches.

Choose the LG C6 if you want the deepest blacks, the best contrast and the fastest response for movies and gaming in a room you can darken.
Choose the LG QNED85 if your room is bright, you want a larger screen size, or you prefer LED brightness over OLED contrast.

Prices

LG C6 Series OLED TV (65"): $1,186.00 at Greentoe (checked today)