Got this lens the day before I left on a business trip and didn't dare to take it with me: I make it a point never to use a lens before I've gained enough confidence in its performance. So today I finally got around testing it and here are some examples. The first 2 are taken with f/2.8, the last one at f/3.3. Wide-open performance isn't really appealing, centre performance is excellent at f/2.8, the corners need stopping down to f/5.6 for very good sharpness. Full-size pics: first, second, third.