If you want proof of a good game with amazing graphics wait for Final Fantasy XIII, unless it is toned down to match the xbox 360 port, which practically has to be a bad port because of limitations.
Uncharted used 40% of the PS3's power, and Killzone only uses 60% so think of the results with 100% of the power, and at the end of the year, it will be the first time developers are fully using the gpu and cpu to their advantages.
Uncharted 2 is confirmed as going to be using 90%-100% of the PS3's power, Final Fantasy XIII will be, God of War 3 will be. You need to stop having a fanboy attude towards the 360, it has some good titles, but none will compared to the three games mentioned, and that is not being a fanboy, it's factual evidence (no offence).
Seems as God of War will be using almost 100% of the GPU then i'm certain the graphics will surpass Killzone 2, especially because the Santa Monica 1st party dev team always deliver what they say they're making.