I guess another issue is mobility. The 85 f/1.2 is a huge hunk of precision optics, and it can be a pain to carry around. If one of your requirements is not being weighed down, then the decision swings in favour of the f/1.8.
Also, the f/1.2 is slow to focus, and it is very hard to get accurate focus shooting at f/1.2; the slightest inaccuracy can lead to the eyes being soft, and the focus being on the nose tip of your subject instead.
Also, the f/1.2 is slow to focus, and it is very hard to get accurate focus shooting at f/1.2; the slightest inaccuracy can lead to the eyes being soft, and the focus being on the nose tip of your subject instead.