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.
From german eurogamer.de review:
Detailed textures, effects send and a lot of details to make, especially on the Xbox first-class figure. Alone on the PS3 are the ones making frame-rate dips for annoying slowdowns. Our colleague from DigitalFoundry came in a few moments just at 15 frames per second. Too little to even begin to go through as a liquid. Disastrous for a shooter.
15 frames per second
15 frames per second
15 frames per second