I just recently bought this lens, but I realized I had other lens priorities, so I can't afford to keep it. However, this lens is an absolute pleasure to use, given that I had very little time with it. I redid some of the shots I took with my M 50/1.7. They were quite sharp and colorful. This might be a nice addition to your collection, since it is quite a bit wider than the M 50/1.7. My copy is in mint condition. Although, there is slight wear on the aperture ring, but that's from normal use. I'm asking $85 shipped for it. Recently, these have seen ridiculous price hikes on eBay. They normally go for $115 nowadays. So, you'll be saving $30. Please PM me if you're interested. I've included two photos. They are uncropped, so I didn't embed them.
http://omploader.org/vYmh5/IMGP0745.JPG http://omploader.org/vYmh6/IMGP0746.JPG