I bought it for the 360 and loved it. The PS3 demo however feels and looks a bit "work in progress" which is a shame because I'm sure its all finished now.
People have had a few years to get to grips with the PS3 now. MGS4 looks stunning (even though its nothing more than an interactive movie) so I'm just a bit miffed that PS3 owners are treat like poor red headed step children. Capcom did a good job converting Lost Planet to the PS3. I had that for both systems and cant say anything bad about the PS3 version.
Its been a couple of years now. The PS3 should really be shining.