"Mounted on a 36Mpix D800 the lens achieves a DxOMark Lens Score of 39, making it one the best performing lenses ever measured in our labs. What?s more with a Sharpness score of 28P-Mpix this lens is the sharpest Nikon mount lens we?ve tested, putting ahead of lenses like the Nikon 85mm f/1.4 and f/1.8 models but also the Sigma 35mm/1.4 and the recently tested 300mm and 400mm f/2.8 telephotos. Additional individual lens metrics scores reveal the lens to have negligible distortion, mild vignetting and reasonably low levels of chromatic aberration. Transmission is very good, though not quite matching the theoretical f/2.0 maximum."
Read more on NikonRumors.com:
http://nikonrumors.com/2013/07/25/ne...#ixzz2aA8vwylZ
http://nikonrumors.com/2013/07/25/ne...r-tested.aspx/