Hi m-bartelt,
If you haven't yet, try doing a search in the archives. Good info found there. Here are a couple to get you started:
http://www.l-camera-forum.com/leica-...mm-lenses.html
http://www.l-camera-forum.com/leica-...6845-50mm.html
And you'll probably get more comments if you repost your question rather than continuing this dialogue here.
all the best,
rt
