Hi Jacob
I have one and love it. It's very sharp from f/2.8 and smaller apertures, and even wide open is quite good. (Certainly sharper than the 85mm f/1.8 Nikkor-H that I've also used.)
The bokeh from the lens is Lovely.
It's big and heavy (more than twice the weight of the 90mm "thin" f/2.8 Tele Elmarit, about 450g vs. 220g), so it tends to be a stay-at-home portrait lens, whereas the tele elmarit will go on trips.
The Canon has a minimum aperture of f/22, whereas the 90mm T-E has f/16. I prefer the Canon on this account, for example for Landscapes on tripod it's nice to stop down.
ONE MINOR ANNOYING feature: the lens is ??single?? cammed, meaning that the whole front of it turns while you focus meaning that the numbers of the aperture ring are not necessarily visible, so if you change apertures after focusing you might need to turn the whole camera over to see what's what.
There's at least one picture taken with this lens in my gallery, and I have more taken since.
Obviously I don't know what you paid for the lens, but in the past couple of years they have grown quite expensive, on the order of the pre-ASPH 90mm summicron or more, and THEN one could ask, are they worth that much? I haven't used the pre-ASPH 90mm summicron, but i imagine that the results are very very similar to the Canon 85/1.8 even though they're different designs. I paid about $300 for mine several years ago.
In any case, ENJOY IT!