Well, I'm on the fence. I have all but a 50 prime now.
8-15L, 16-35L, 24-70 2.8L Mk 2, 24-105L, 70-200 2.8L Mk 2, 35L, 85L, 100L Macro, 135 2L.
I didn't care for the 50 1.2 and sold my 50 1.4 years ago. For that focal range, I just used my zoom. I think I am chasing the sharpest lens dream and really don't need this thing. These images look pretty good though. All L glass so far, but recent Sigmas are pretty awesome.