http://www.dxomark.com/index.php/News/DxOMark-news/The-Nikon-D800-is-the-new-king-of-DxOMark-with-a-score-of-95
Via Digicame-Info (Japanese)
There is also an useful quick comparison table for comparing other FF DSLRs for their DxOMarks and sub-scores.
Actually, the DxOMark and sub-scores of the D800 exceed even those of the 645D! :-o
Read Also:-
IR Measurbation: 645D Vs D800
645D DxOMark is Out
New DA Limited Lens Tests at DxO