Hi I have only recently bought the 17mm Olympus having used the original 2.8 on the first Olympus pen, and then the pana 20mm (great but so slow to focus) Like others in this thread I had favoured the 12mm and 45mm then the wonderful 75mm. However having used it now for a few months it has become the lens that I reach for when I go out. Its small, versatile and performs pretty well for me open and stopped down. I'm not into too much testing more what I can get out of it in terms of images. I've been very pleased and happy to share some of the lens results i've achieved on the flckr page here.