Just wondering, I have been using my 50 1.4 and for close focusing (less than 3m) the plane of focus is awfully narrow. And when using a split image with matte screen, the image can look rather sharp in the matte section , only to be not correctly focused in the split screen. In principle, a 85mm with the same focal ratio should be even harder to focus, due to the even narrower focal plane. Is that the case. And if so, what are some of the problems and experiences people have had?