Yikes, not too many options for an 85mm f1.2. I started down this path thinking 35mm for full-body shots at 10', with a background at 5' behind the subject. And then the question became one of whether the 35mm f1.2 would be necessary, or perhaps the 18-35mm 1.8. I might have to settle for f1.2 (settle?) and have a non-descript background slightly out of focus.
Still, all good information. Thanks for the help! For now, I'll keep to the outdoors with my 70-200mm. That gives me a lot more room to stage a portrait.