how does killzone 2 prove it is more powerful? because you like the look better?
the ps3 is a clusterfuck of a design, and has real limitations. the sega saturn had some ace programmers bring us vf2 and doa, but did that make it superior to the playstation just because no-one on the latter machine attempted similar tricks?
only on EB (well, it probably happens on xbox forums too) do you see people acting like killzone 2 is nothing special. everywhere else, you see comments like "comes close to the CG trailer" (regardless of how true that statement is) and "yes, that's real-time" etc.
the ps3 does have limitations (biggest being OS ram consumption right now), but it's obviously got power as well. it's common knowledge that you can't tackle ps3 development like you do PC/360 development, yet you constantly have people trying to claim that "ease of development" = "power." developers aren't used to working with a cpu like cell, and are even less used to using something like cell to push video. but ever since the beginning, ps3 was designed for that very thing--you even had tech demos showing vast 3D landscapes rendered real-time without using the RSX at all.
you could argue that wasn't wise in a market with an increasing number of multiplatform titles (because that's a big reason for why it's harder to get multiplatform games running on ps3), but you can't really make a valid claim that "RSX < xenos, therefor PS3 < 360."
i know you don't like to admit it, but killzone 2 is more than just nice art direction. the deffered rendering is a legitimate graphical feature that puts KZ2 above par in lighting (i believe KZ2 is the first game to accomplish it with MSAA, which was considered not possible/viable--it's basically a breakthrough in rendering techniques). each room has the appearance of having atmosphere and weight to it, which many previewers bring up, and can be attributed to the advanced lighting technique KZ2 utilizes. the excellent post process effects aren't free, despite you repeatedly using them as the head of a joke to discount the graphics. good graphics are more than high polycounts and shaders, but i wouldn't really say KZ2 is necessarily lacking in those areas either.
you can read more about the deferred rendering here:
http://www.develop-conference.com/developconference/downloads/vwsection/Deferred%20Rendering%20in%20Killzone.pdf