I have (or still) so the 85mm 1.4 Nikon and Sigma, I believe a lab test would determine the Nikon assist better values, but even in poster format / Prints
I can make no winner.
Will even the new Sigma 35mm 1.4 as soon as it is to test the market.
All I can say so, wasted no time .... testing everyone has different eyes.
Otherwise, for all Hoppyfotografen, you buy only decent lenses and not a D 800 / D 600, thinking 36 / 24MP make beautiful pictures.
By the way: From bokeh and sharpness I'm not talking, which I put in such glasses in the price range to display properly if Sigma, Nikon and and and