why are people mixing topics & systems to get the best "IQ"? If you made a 'perfect shot' (is there already one availible) - IQ is a tiny piece in a mosaic to a every great image.
Using a OM 4.5/135 (THE standard in Macro Lenses) will only work on film - the Sonnar 2.8/85 is a fantasic lens (anybody with a C/Y body out there)
If you can't cope with handling as it was thought by designer of camera system - what will be the use of a so called high-end-optic?
Ever tried to do birding with a leica M or complained about AF accuracy in landscape? Do painters discuss about quality of there tools? They discuss about colors, composition, skills, setup ...
Photographers tend to stick on technical data - which is only a single (maybe the tinyest) contribution to a great image. IMHO the complete setup defines the technical quality of an picture, battery failure, portability, haptics - and to be honest: Does an audiance discuss about pixels or about the 10 (or any other amount of aspects) criterias that make a picture to an unforgettible image