The 50 1.2 is a wonderful lens. Wide open, the lens has a wonderfully impressionistic rendering, but becomes very sharp by F2.0. I use mine on my Nikon film cameras (F6, F2AS, FM3a and FE2) as well as on my Sony mirrorless A7Riii (with Novoflex adapter). I do NOT use it with my Nikon D750 and D850 (even with magnifying viewfinder eyepieces), as I find focusing very precisely with DSLRs somewhat lacking. However, with mirrorless and their magnifying function and image stabilization, one can get wonderfully precise focus and extremely sharp images with this lens that can rival modern mirrorless lenses for sharpness, albeit typically with somewhat lower contrast and higher flare (which is not necessarily a bad thing in creating mood and avoiding an overly clinical look).
I have never subscribed to the oft repeated (false) mantra that many older lenses will perform badly on high resolution sensors. In fact, it has been my experience -- in using many vintage OM Zuiko, Nikkor, Minolta MD, Tamron SP and Vivitar Series 1 lenses on my Sony A7Riii (42 mpx) with HIGH QUALITY Novoflex adapters (not the cheap $15-30 adapters with terrible tolerances) -- that pretty much every lens can give sharper images on high resolution mirrorless digital than on their original film bodies. Sure, the vintage lenses may still not be quite as good as modern high end digital -- especially in terms of flare control and contrast -- but as I noted above, this often is not a bad thing if one is seeking to create images that are more atmospheric or imbued with character as opposed to being overly sterile and clinical looking. In fact, I find myself using mist filters more and more often these days on my high resolution modern digital lenses on high resolution bodies to slightly tamp down their hyper sharpness and contrast to obtain photos that more closely represent film images.
