Dengeki PS3 (Japan) interviewed FFXIII's producers in the latest issue of the magazine. Near the end of the interview, Producer Kitase stated "The demo of FFXIII will utilize around 50% of PS3's capability, whereas the full version will utilize close to 100%". The scans of the magazine can be found in the links "1 2 3" at the top of the translated article.
im not much of a graphics whore but i highly doubt that
sure 13 looks good but it doesn't look all that great
last i heard didn't uncharted 2 look better than this?