Which is better for a bright living room?

The C3 has Brightness Booster, which lifts output for well-lit rooms. The C2 counters with an anti-reflective coating that reduces glare. If reflections are your main problem, the C2's finish helps; if overall punch matters more, take the C3.

Is the C3 worth stepping up to over the C2?

Yes for most buyers. The C3 adds the α9 Gen6 processor, Brightness Booster, webOS 23, Dolby Vision and Dolby Atmos. The C2 keeps the same panel size, 120 Hz refresh and four HDMI ports.

Which has better picture quality?

Both use OLED evo panels with infinite contrast, so blacks and viewing angles are close. The C3's newer processor and brightness boost give it an edge on HDR highlights and upscaling.

Do both support 120 Hz gaming?

Yes. Both list 120 Hz refresh and four HDMI inputs, so console and PC gaming at high frame rates works on either.

Neither has a published lifespan advantage. Both are OLED panels from the same family, and owner ratings for the C3 are strong. Panel care settings on either set matter more than the model year.

Does the C2 have Dolby Vision?

Its listed specs show HDR without Dolby Vision, while the C3 lists Dolby Vision, HDR10 and HLG. If Dolby Vision content matters to you, the C3 is the safer pick.

LG OLED evo C3 4K Smart TV vs LG C2 77-Inch OLED evo TV

Both are 77-inch LG OLED evo sets with 120 Hz panels, four HDMI ports and infinite contrast, so the picture gap is smaller than the model names suggest. The C3 adds the α9 Gen6 processor, Brightness Booster, webOS 23 and Dolby Vision plus Dolby Atmos support, and owners rate it highly for dark-scene detail and wide viewing angles. The C2 is the older generation with webOS 22 and a glossy anti-reflective finish; it suits buyers who want the same panel size and OLED blacks with fewer smart features. Choose the C3 unless the older platform and finish matter more to you.

Choose the LG OLED evo C3 if you want the newer processor, Brightness Booster and webOS 23 with Dolby Vision and Dolby Atmos.
Choose the LG C2 if you want a 77-inch OLED evo panel with a glossy anti-reflective finish and do not need the newer chip or platform.

Prices

LG OLED evo C3 4K Smart TV: $1,183.91 at Best Buy (last seen Nov 2)