I had RF85 1.2 but because of weight I switched it for RF50 1.2.
Now I have RF50 1.2 and RF15-35 2.8. I'm waiting for RF16 1.4 and RF24 1.2 and I'll sell my RF15-35.
It's sad cause we can easily find differences on MTF charts between RF 85 1.2 vs EF 85 1.2 II, RF 50 1.2 vs EF 50 1.2, RF 24-70 vs EF 24-70 II, but with RF 15-35 vs EF 16-35 4.0 IS it's not so sweet.