Canon 85/2: Chrome, heavy, slow focus. Nice results, nearly as good as the 85/1.8 when both are equivalent shape optics-wise. Would be hard to prefer one over the other, the f/2 looks a bit "older" in it's images produced vs. the more modern formulation of the f/1.8 since that was one of the last LTM lenses Canon developed.
Canon 85/1.8: I found a beater that needed work and I have it in good enough shape to shoot with it now. Same glass as the SLR Canon FL 85/1.8. Heavy but short.
Canon 100/3.5: Great and the early 34mm filter thread version is TINY, I like it better than the Elmar 90/4 even if filters and hoods are harder to find.
Elmar 90/4: Fine but somewhat uninspiring for me. I guess I just prefer the Canons' fit and finish as I'm more of a LTM Canon fan than Barnack Leicas.
Schacht Travenar 85/2.8: I have one but someone pulled it all apart then put it on eBay and haven't had time to get to putting it all back together. Will be a very small 85mm, quite lightweight due to the aluminum body.