I recently sent the D800 in to Nikon because I could not AF fine tune my 70-200 / TC-20e combo as it was too far out of range. I got the body back today, although the lens and TC are following (long story). Apparently they have adjusted both the body and the lens combo. I now need to fine tune all my lenses again with the Reiken software. I don't mind doing that if the end result is good. I'll post an update on the lenses when they come back. They should be very good quality if the focus is spot on, given that live view focused perfectly and the images were impressive. Nikon has done the work free of charge, including the lens adjustment which I'm pleased about as it's just gone out of warranty