Joe - While I understand how the 85 might be "too tight", I have to say this: I've shot a LOT of basketball over the years, and by far the lens I use most is the 70-200 f/2.8L. Now, on my MkIIN, this is the equivalent of a 91mm lens. Very few of my shots are taken at the 70mm length, though. If I find I'm too tight, I just moved further away from the hoop.
The 85 on a XXD camera equates to a 136mm lens, which might be a little tight, but then again, if so, just zoom with your feet. Or use a 70-200 and employ a flash if your ambient light can't support f/2.8 - or heck, shoot with a flash/strobe ANYWAYS since the results will be much sharper, with better color saturation, no issues with lights color cycling, etc.
The 50, even on a 1.6X body, is gonna be way loose for all but the few shots taken right under the basket. A lot of action happens between mid-court and the top of the key, and a 50 will end up being to wide for almost all of this.