Originally posted by luftfluss But for "other things than just sharpness", the DA 18-135 seems to do very well. So if the new 16-85 isn't appreciably sharper - particularly on the edges - than the 18-135, then the 16-85 is a failure, IMO.
(...).
Sharpness is not the alpha and the omega for a lens. One can also take advantage of less distortion, less lateral chromatic aberration, less astigmatism (for a more pleasant bokeh for instance), less coma in the corners and so on.
If only 'pure' sharpness mattered, the FA Limiteds would be considered as second-tier lenses, which they definitely aren't.