I think it has enough power.
Power is not so important today.
Of course I hoped it would have more power, but 520/560 PS are still enough.
With todays technic you do not need much power for fast laptimes (or even a good driver).
I hope we will see a track time soon.
A comparision between it and the GT-R would be awesome,too.
For all who think it have not enough power:
Wait for the GT2 (RS) ;)