I rather like it... except for the bokeh. I had an 85/1.4D that I 100% loved. Other than the lack of modern coatings, and, to a lesser extent, bayonet hood mounts, they're still really good.
You mean the 55/1.2? I had an opportunity to pick up a 50/1.2, but passed as it was an AIS - and I wasn't sure the rear element would clear the mirror box arc. Used DSLRs are cheap these days, but they're still $$$ to get repaired.