While I have not done a lot of testing, this lens does seem to give a sharp image, when stopped down a couple of stops. It is a little soft, especially in the corners, at wider f-stops, but at f8 and f11 it is good . . . maybe even quite sharp.
Solid; lens hood fits well with positive click; good range from 15-36mm equiv
A little heavy; but it is lighter than others; so I guess compared to the competition this is not really a con