There is (there was a url link here which no longer exists) in the enlarging subforum about dramatically different tonal renderings from prints enlarged from the same negative using different enlarger lenses. It seems the lenses with better corner-to-center sharpness, such as the APOs, produced projected images higher in contrast and therefore of a more compressed tonal scale, making it more difficult to get good mid-tones and highlights in the finished print. Conversely, older, less well corrected lenses seemed to produce projected images that, while less sharp, had a more pleasing tonal range when printed on silver paper.
I wonder if a similar effect is happening in your comparison of old Russian rangefinders versus Japanese cameras; perhaps in order to get more pleasing tones from silver gelatin film we require lenses that sacrifice overall sharpness for a softer pallet, excess contrast being the death-knell of a good silver gelatin print, in my experience.
~Joe