I have both. I mean the ef 85mm f1.2L and a woman. They are pretty similar as to how hard they are to master. The 85mil f1.2 is a real jewel. So is the woman as we approach our 50th. 
I love mine but it is not a lens for the guy that wants to just shoot. It will take some getting used to and some serious learning to get the best. It is capable of delivering stunning results. Just like its shorter sibling the 50mil f1.2.
So, the question is are you willing?
I will add the slow focus myth is really beginning to bother me. Does it focus slower than some of the quickest lenses? Yes it does but there are folks that are sitting on their couch and running it from close to infinity. Something in the real world you don't do....often anyway. I know, they read all the reviews, too bad they never actually used one! Much less tired to learn it. At the reasonable distances you normally see it focuses just fine. Is it a lens that you would use to track a running back at a football game? No but I wouldn't choose any 85mil for that job. So ignore the false slow focus issue.
Golf?............uck!!!!!!!
OK, time will tell.
The 85mil on a current DSLR that has a full frame sensor will show the exact same thing as you old film 35mm camera. Same, same.
The 85mm f1.2L is a limited purpose lens. It is a lens like no other 85. Even so for the 50mm f1.2L. You will love it or you will come to hate it. I doubt there is a middle ground for either of these twins.
They are expensive. They are big. They are heavy. They are slow. They are beautiful. 
