Is the 42-inch C3 good for PS5 and Xbox Series X?

Yes. All four HDMI ports are 2.1, so you get 4K at 120Hz, VRR and auto low-latency mode. Input lag is low enough for competitive play.

How does it compare with the C2?

The C3 uses a brighter evo panel and a newer processor with better upscaling and webOS. Picture and gaming features are close, so a discounted C2 is still a reasonable alternative.

Is it bright enough for a bright room?

It handles a dim room best. In a sunlit room with windows opposite the screen, reflections and modest peak brightness wash out dark scenes. A bright LED-LCD suits that room better.

Can it be used as a PC monitor?

Yes. It accepts 4K at 120Hz over HDMI 2.1 and has a game mode, and many owners use it on a desk. Keep static taskbars and logos moving to limit image retention.

Does it support Dolby Vision and Dolby Atmos?

Yes. It handles Dolby Vision, HDR10 and HLG, and decodes Dolby Atmos and DTS:X, though the built-in speakers cannot do Atmos justice. Use eARC for a soundbar.