The PS3 version of Crysis 2 has particular idiosyncracies. After playing both console versions, and playing through the same set of levels multiple times on both consoles, it became clear to a number of editors at IGN that the PS3 version is lacking somewhat in comparison to the 360 version of the game. The game still looks great on PS3, but the framerate is less consistent, the resolution is lower (in the neighborhood of 10% lower than the Xbox 360 release), and certain graphical effects and some lighting appear dialed back. In layman's terms, there are more jagged edges in the PS3 version of the game, and things get choppy more often than its 360 counterpart, which hurts controller response. The 360 is not immune to this, it just doesn't happen as often.
And from eurogamer:
[Editor's note: Digital Foundry reports that frame rate takes a hit on the console versions of Crysis 2, so PC is the version to go for if you have a capable machine. Look out for a Face-Off soon. However, we reviewed from the 360 version and were plenty impressed regardless.]