Has anyone got or used one of these? If so, how sharp is it and how does it compare with the 24-105mm? Pretty please! My current 'walk about' lens is a Sigma 24-135mm f:2.8-4.5, but frankly, it's not terribly sharp. I would be quite happy to shorten the zoom range if it improved optical quality. Not enough 24mp full frame users on Dyxum have rated it to make an informed opinion, and Kurt Munger hasn't reviewed it. I would not be using it with flash, so the lack of the 'D' doesn't bother me. Ta everso!