Sony says PS3 only console powerful enough for Killzone 2

[CAL4M1TY]

Sony's right though, you couldn't play KZ2 on the Wii because the graphics on the Wii aren't capable of making a game in HD AND you can't play it on the 360 because the 360 controller doesn't have tilt functionality.

Therefore, the PS3 is indeed the only console that can play Killzone 2.