So far both lens have exceeded my expectations. The Sigma is very sharp and spot on. Having never really used the 60mm FoV I will have to play with it I figure it really is just a few steps back from a 50mm FoV. The Olympus is very nice a step up and weather sealed and 12mm both of which I wanted. Someday I will own the 12-40 f2.8 but pennies must be saved for that one. Oh if you guys would I had a question on the 12-50 in a separate thread. Jim Some flower shots late in the day from the Sigma. And one of Winter in color from the Olympus .