First looking at sharpness, at 36mm centrally the image is muddy and only gives a fair level of sharpness from f/2.8 through to f/8. Beyond that, at f/11 and f/16 it is poor. The edges are poor at ...

At 17mm, central sharpness is outstanding from f/2.8 through to f/8, excellent at f/11, very good at f/16 and good at f/22. The edges are excellent at f/2.8, outstanding at f/4, excellent at f/5.6 ...