Over the years I've had the folowing 50's:1.4 Nikkor, D.R. Summicron, 1969 vintage Summicron, 1.8 Yashinon, 2.5 Hektor (uncoated), 1.8 Canon (chrome), plus a single cam Summicron for Leicaflex and several 50's in Pentax thread, including a 1.8 Yashinon, 1.9 Vivitar, 2.8 Tessar, 2 Biotar (58mm). Factor in the tonal difference of various generations of assorted Kodak, Ilford, Agfa, Adox, Perutz, Ferrania, etc. films souped in an assortment of developers. I doubt that even our official lens tester Raid could go through my negatives and match them up with the lenses used.
Comparing prints, even straight unmanipulated 8x10's, you have the variables of the characteristic (H&D) curve of the various papers, whether they were printed on a diffusion enlarger or a condensor enlarger, whether it was a single condensor (some Dursts and perhaps others), double condensor, or triple, as in some 6x6cm Omegas which use a third condensor for 35mm.
We also have to consider the enlarging lens, four element or six, or a cheapy three element, and how it was coated. A 1961 El Nikkor isn't the same as a current version.
A scanned negative doesn't print like a wet printed negative.
I bring up all of these things because I'm pretty sure that some of us might be making our choice of this lens over that one based on variables in our work flow that have nothing at all to do with which taking lens was chosen.