I had a couple Summarits, mine were very clean. They were a bit 'weird' wide open, but withal a good example of the double Gauss type. AFAIK, the Summarits were all coated postwar examples of the prewar uncoated Xenon which was actually made for Leitz by Schneider and a real handful as regards flare.
Originally Posted by rich815
My prewar f:2 Sonnar was pretty well behaved, use it with a good shade and I bet you'll really like it.
The f:1.5 version is somewhat of an anomaly, actually being regarded as better than it's slower sibling!
I think the old Sonnars are aptly named, there's something bright and cheerful about them. I see this in my J-8 as well.