I don't have any experience with the 85/1.2L, but I used to own an 85/1.8, and I really disliked the "spring tension" clip-on nature of that hood. So much more difficult -- unnecessarily so, I thought -- to attach and remove it, compared to the bayonet-style mount of the hoods on my other lenses.
That hood is NOT the reason why I sold my 85/1.8 (I upgraded to a 100/2.8L IS), but while I really liked that lens, I don't miss its hood one bit. Clearly a lens hood isn't the most important thing in life -- let alone photography -- but its one of those little things that is either so well designed that you rarely think about it, or is so poorly designed that it ruins an otherwise perfect experience.