Tested on the Nikon 800 and 810 - surprisingly NOT fehlfokus. Compared with the Nikkor 50 / 1.8 significantly better picture and more beautiful bokeh Compared with the Nikkor 24-70 mm 2.8 at 50mm (My rounder) an incredibly better picture!
Wow - I'll still fill me after the Sigma 35mm type this 50s style in the pocket. As a landscape photographer I am grateful for each Pixelchen that will be settled on my Nikon with life.