This question I tried a few sites on the net and seems no answer. Well, if under the same situation will there be any different in color, sharpness, layer by using a Sonnar lens and Planar lens? People sent me the MTF chart which cannot really answer the question. Suppose these 2 types are design differently, which lens will have a better result? For ex&le, a Marko-Sonnar 100/2.8 and a Planar 85mm/1.4 use at the same F stop, same film, will there be a different?