The XF 14mm F2.8 R is a relatively rare example of a genuinely wideangle, high quality prime lens for any camera type other than full frame SLRs. The closest comparisons lie with the Olympus M.Zuiko Digital ED 12mm 1:2 for Micro Four Thirds and Pentax's smc DA 15mm F4 ED AL Limited for its APS-C SLRs, both of which also offer premium metal-barrelled construction and 'proper' manual focus rings with distance and depth of field scales. Indeed the 14mm's push/pull manual focus switchover mechanism bears more than a passing resemblance to Olympus's version. They're not strictly alternatives, of course; they all work on different camera systems. But of the three, the 14mm offers the widest view.
Via Thomas Menk