I didn't try Xbox 360 or PC demo, but used to play Killzone 3 the other day.
So here's my thought about visual quality in Crysis 2 PS3 demo (played it for about 15 minutes):
- resolution is well below 720P
- The sound is buggy (at the beginning i didn't hear any gunshot and in a couple of minutes everything goes in complete silence
- Framerate is below 30FPS. You can feel the lag even if you in increase sensitivity.
- Texture quality, for the most part, is terrible
- Lighting is flat. Just from videos i think ѝбоь 360 version is a miles better.
- Water quality is good.
- Pop-up is not that bad, but the LOD is awful (just look that the big boat)
- Overall image quality is very bad
Killzone 3 this is not. Very disappointed with the demo from visual standpoint (can't judge on gameplay yet) :/ I expected more - it's just don't look good on PS3...