Manufacturers go to great lengths to make sure the edge sharpness of their lenses are as near to the centre sharpness as possible, i look for a lens that is overall sharp.
i cannot see anything nice about having the sharp centre and the rest out of focus???
the same effect can be done with sweet wrappers etc, but why do it, to me it is distracting, my eyes go to the edge when only the centre is sharp.
what would be classed a serious fault in a lens and would be criticised heavily by the press is now a product that costs a lot??????