Summary: When I start spending this kind of money, I expect excellent optics. This not an example. over a number of focal lengths the end of lens casts a semi-circular shadow onto the suject = bad design. The images seen on the own-camera viewfinder are unusably soft when viewed at 10x. I would not recommmend Olympus lenses on the basis of looking into this one and the 14-54mm f2.8/3.5.
Pros: The shape of the lens is attractive.
Cons: A mid-to low quality resolution for top prices.