This is a comparison of the actual sharpness of a lens, at different apertures and focal lenghts. Several shots are processed by Lens Sharpness Review, then left for interpretation.
Note: This copy of the lens shows focusing problems, especially on the wide end.
First picture from each row is corner pic, second is center pic with the same aperture. All pictures are 100% crops of original JPEGs.
Original pictures look like this:
Body type: Canon EOS 350D DIGITAL.