Just posted in my Nikon D800 review is what seems to me a stunning and compelling ISO series head-to-head comparison of the Nikon D800 to the Nikon D3s. I felt quite excited to see these results.
A MUST READ for anyone making the Nikon D800 vs D3s decision or similar.
Image below is a crop.
See my Nikon gear page for D800 availability status.