Anyone with experience with this lens? I'm thinking of picking one up for general purpose telephoto plus macro photography with a close-up diopter. I see anecdotal reports here and there, but see few photos with the lens taken with m43 equipment so far. I'm considering either this or a 70-210/4 MD, which is less than half the price. Or, if you have any better suggestions, I'm open to hearing them. Thanks!