skimmed through the responses, very good discussion.
Just to clarify a few things.
I scan my negatives and make wetprints in the darkroom. I care about my wetprints and negatives more than I care about my scans...
I have no problems with the contrast levels of my current lenses but I have not tried anything modern. I would be interested in perhaps changing lenses mid-roll. Say for instance a 1950's 50mm Sonnar with a 2012 28mm Biogon. Things like that.