"Sharpness in the centre portion of the frame at 18mm is already excellent at maximum aperture and the quality towards the edges is good enough. Stopping down improves clarity across the frame and peak sharpness is achieved at f/8, where the clarity is excellent across the frame.
Imaging Resource goes deep down on some aspects of the D800/E, like that of the missing (or not so missing) antialiasing filter:
"Anti-aliasing. Like almost all Bayer-filtered cameras, the Nikon D800 includes an optical low-pass filter, sited just above the image sensor.
The D800/D800E is finally upon us. Most of the specs have been know beforehand, but still, some surprises managed to escape the leaky chorus. The cameras can already be pre-ordered at various places. (D800 and D800E preorder links at Amazon, D800E at B&H) We have included press releases from both Nikon UK and US.
January 6, 2012
A fast, medium-telephoto fixed focal length lens with a focal length of 85 mm and a maximum aperture of f/1.8 compatible with the Nikon FX-format