I'm not sure about the validity of a number of the Playstation 3 games. Many of the GameSpy reporters mentioned not seeing much real-time stuff.
Honestly I agree, during the Sony conference we only saw them controlling a few demonstrations of the power of the console.
While Unreal 3 / Gears of War.. was running beautifully, with the guys 'josh' talking us through it while controlling the camera; it didn't match the sheer level of what was going on in Killzone 2.
Although I'm not doubting the graphics could be done on the PS3, the sheer number of soliders, that's what makes it a little iffy.
I mean you have at one point like 100 soliders running around, all of which doing thier own thing with what looks to be 15,000+ poly mesh let along the shaders.
Nvidia have still no unveiled the RSX power to the developer forum yet, so until I see the specs on that. I'm going to take the Playstation 3 footage with a pinch of salt.