Hey there,
As a owner of the 35L, I can say that on FF cameras, it is a wonderful FL. Not great for portrait work, obviously, but excellent for miscellaneous work like shots of the wedding cake, flowers, wedding bands, etc. It has top notch IQ, even wide open.
I think the 50/1.2 is a little overpriced myself. I know a guy that does some weddings and he swears by it---even over his 85/1.2L. Hope this helps...