Agreed. The build quality is excellent, even though I did personally have problems with the size of the lens release. I find that I have to pull back focus just to the left of the infinity mark for true infinity focus. I tried to shim it, but failed at getting the right thickness a couple of times and just gave up.
On a related note, I noticed some interesting behavior with my CV 35/1.4 that I need to test more thoroughly. It seems that the extreme corners actually sharpen up when I focus PAST infinity a bit!? I wouldn't have noticed this if the adapter didn't let me focus past the infinity mark. I believe this means either one of two things. I'm crazy and I need to test the lens in a more controlled scenario, or the lens has some field curvature. I'm probably just crazy, but I'll test it some more later. Wouldn't it be hilarious if others having smearing problems at the edges with various just had adapters that weren't nailing infinity as well as they thought! :ROTFL: (kidding, i doubt it.)
I'm interested to hear how your Summicron does with purple fringing. My only complaint about the CV is that I get quite a bit of it when I have blown highlights in a contrasty setting. For example, the chrome on a bumper, or an extremely backlit subject. The source for the kind of fringing I'm getting has been debated on forums forever. Sensor? Lens? The combination? So, I'm curious how the Summicron handles it, because Leica lenses on the M8/M9 exhibit this sometimes, too. Granted, it gets a little better on mine at f2, and much better at f2.8 (or, of course, not blowing out highlights
)
Here is a link to the type of fringing I'm talking about. Mine is never this extreme:
http://www.l-camera-forum.com/leica-forum/1132982-post39.html