GT5 Prologue is the benchmark of driivng sim games - i don't think MS can visually make a game look as nice on the current 360, not because of the power of the 360 but rather they haven't a team such as Digital Polyphony who have spent so much time just doing what they do.
They'll certainly struggle now that Bizarre aren't exclusive to them for the PGR series.
I would disagree about PGR not looking as nice, I'd say environmentally it far surpasses it for details (as well as enjoyment of tracks), but the cars are left behind in terms of details both interior and exterior of those in Gran Turismo 5 which are truly stunning.
Can't wait to see what they look like in the Next-Generation of consoles.
