Well the PS3 has been playing catch-up on the multi-platforms. You can go to gamespot for comparisons. As for the exclusives, it also depends a little on development time and the engine they are using. KZ2 has an engine that's optimized for the PS3 so it's one of the games that can get the best out of the system.
GeOW2 is simply unreal engine (same engine used for Mirror's Edge, Mortal Kombat vs DC Universe etc.) and that engine i think has reached its limit with GeOW2, but that does not mean the X360 has reached its limit, since they could always build an engine to bring the specific X360 features to life. Even though the X360 is basically a "dumb pc" like a midway dev said, they can still squeeze more out.
But basically the PS3 still has cell power left, but is really held back by the low bandwidth of the system. It took a LONG time for KZ2 to come out, same as most games that look great on the PS3. I think you are starting to see its power now because it takes a long time to develop for the PS3. It IS harder. That's a fact. One little proof of this is the Far Cry 2 port.. It took 3 people to port it from PC to X360, but 14 to port it from PC to PS3 in the same amount of time. That's almost 5 times as much..
Truth does not fear investigation
