16mm performance ?

i have found the 16mm to be a great little lens edge performance can be poor but i found to get the best results change your focus point to one of the corners and the edges hold up much much better. i am very picky and do look at 100% i have not had issues any more with corner performance.

i dont know about max aperture i normally use it around f11, but corner performance at max aperture should, in most situations not be so important