I really need to stop looking for old lenses. This time around, it's a Minolta 58mm f/1.2 in MC form. Another impressively solid fast normal lens designed in the 60's.
I've only used it on two outings, and so far I haven't managed to connect with it. Veiling flare galore wide open, slightly more than the Nikon or Canon that I also own. It definitely doesn't like a strong light source outside of the frame though. My initial photos were sorely lacking in contrast, and even showed a slight rainbow flare in one image. I had a hood on it for the second outing, but that makes it a little more unwieldy with all the weight out front, and I think the hood is vignetting a bit.
I think it's time to throw in the towel, and get a modern f/1.2.
On a sitekeeping note, I've updated all the broken image links. I had to re-edit some of the photos, as the original posted ones are not on my hard drive.