Ebay item #220055172839 ZEISS SONNAR f1.5 50mm for LEICA SCREW CAMERAS .I got this as new toy for my M5 and M2 and was wondering if I got a good buy (man that's cheap in my opinion but why so cheap I wonder) or is this lens a dog---I've received the lens and the glass and coating are fabulous and the lens barrel looks much better in person--smooth iris---a very nice lens. I just shot a roll (itchy I guess ) of Fuji Neopan 400 and am yet to process !! Anyone have any experience with this Zeiss Sonnar ?--much cheaper than a Summilux (that I do have) but I'm curious as to how it'll compare against the Summilux 50 1.4 !!