In my experience with a couple different 40mm Summicron examples, they have been excellent and very nice quality lenses. The great thing about them is they don't seem to go for as much as a better known lens like the 50mm. If you want something a little wider, and a better walk around lens (it's much lighter and smaller than the 50 cron), and are on a budget; buy it. It's a very good quality lens made in Germany by leica (probably at least designed by Minolta). It's single coated so it's a little soft for color stuff, but I personally like that look. If you shoot black and white more, don't even hesitate.