The PS3 is known to be more difficult to code for, like it's predecessor PS2 which if you look at early titles on that system compared to later titles like God of War, the difference was staggering. The Xbox 360 and Wii are more easy to extract good performance from so should theoretically have less room to grow in their demonstrable power relatively speaking.
Wether any developer will ever spend enough effort to show the potential power of PS3 is an entirely different matter.
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Wether any developer will ever spend enough effort to show the potential power of PS3 is an entirely different matter.