I'm a huge fan of the 100/2.0 - - - even though I'm using the 100/2.8macro
Had the 85/1.8... never really cozied up to it, but that was FF, not crop.
I think if I was shooting all crop sensors, the 85/1.8 might be worth another look.
I like the foreshortening that the added length gives. For me, on FF, a 135mm is about the best for portrait work, but camera-subject distance becomes a problem indoors many times.
The one and only "fashion" shoot I did, was with an F1 and 200/2.8 back in film days. It did GREAT because the entire shoot was in a silk top courtyard. Add a little fill for specularity sake, and whammo... done deal!