Gnosis on 17 December 2008
Both games look amazing. But going off the pictures that luisgvm posted, I think it's clear that Final Fantasy XIII looks better, and the pictures that were posted of XIII were about 2 years old. The latest screens of final fantasy XIII here http://finalfantasy-xiii.net/2008/12/17/jump-scan-new-final-fantasy-xiii-battle-screenshots.html look awesome, so its hard to beat.
That said, I had no idea SO4, looked so good! It looks awesome.
