"The Olympus 12mm f:2 is an amazingly light and compact lens, which fits comfortably in a shirt pocket, even with the hood attached. In my tests, compared with the Pany 12-35 f:2.8 and 7-14 f:4, at 12mm the lens is as good in the centre, but softer in the corners by at least 10-15% (one step on the...