There is nothing really new in the D800 Technical Manual. Everything discussed is a problem in earlier Nikon (and I expect Canon) DSLRs. It 's just that the small size of the pixels makes it more apparent.
If you view your image at 100% on your monitor, take advantage of the high pixel count by making very large prints, or do extreme cropping you will see the difference.
If you view your image at the same size as you have done with previous DSLRs, you will see as good as or better images than before.
Gary in SE Michigan, USA. Nikonians membership - My most important photographic investment, after the camera. D4, D810, D300 (720nm IR conversion), D90, F6, FM3a (black), FM2n (chrome) YashicaMat 124, Graflex Speed Graphic 4x5 My Nikonians Gallery & Our Chapter Gallery