By the way, all the Cell processing power means shit when they PS3's RAM allocation is poor and the OS devours over 90mb of it.
Xbox 360 games will continue to look better because:
A. It has a better GPU and more RAM available to it.
B. Its OS only uses up around 32mb which leaves more space for actual game content.
C. Its easier to extract power from the system. Like seriously, which developers are going to waste their time trying to 'unlock' the PS3's power. If they code a game so specific to the PS3's hardware it wont work very well at all if they decide to port it to another console.
D. The Cell is overrated. Most of its SPU's will not produce anything amazing unless its all in unison and besides all that, GPU has more to do with graphics than the CPU incase you didnt realise which is why XBox 1 graphics > PS2 graphics even though PS2 CPU > XBox CPU.