I've owned it for only a few hours now but already love it! Such a versatile lens, and so far the image quality is quite impressive. (to hopefully stop the f/4 vs. f/2.8 "debate" before it begins, because of the type of photography I do I had NO need for the f/2.8 version...)
Like others have said, I know this isn't exaclty the required "duck" picture I should be posting here, but it's as close as I can get today! (as you can see, even my cat isn't in the mood for photography today, imagine that!) I know I always say this, but the actual image looks MUCH better than the small, compressed version I posted here.
This lens is a keeper!
111mm, ISO 400, f/5.6, 1/30
100% crop (untouched except for the cropping)







