The last releases from Sigma got me thinking. There is a lot of excitement about the Art 35 and 50 mm lense and I got excited myself and replaced my Zeiss Distagon 35 with the Sigma.
If I analyse my own portraits, be it headshots or einvironmental, sharpness is very-very important, but not the most important.
1. The lens should be relatively sharp, you need to have eyes sharp
2. Very-very reliable AF. MF is a no go for me...not on my Canon 5D MKIII
3. Creamy and pleasing bokeh, it cannot be nervous as in the case of Sigma
I do most of my portraits with 70-200 because it is sharp...as sharp as primes, has super AF and really nice bokeh.
I still think 85L and 50L are better for portraits simply because of the bokeh.
I would say Zeiss would be best of all, but I will never bother because of the MF.



