Sorry Michael, good question!
Sharpening is a complex issue. Is the PSF (Point Spread Function) known, the original image can be reconstructed. This was pretty well demonstrated in the original images from the "Hubble Space Teleskop" which had a small error that could be reproduced. Now, the AA-filter works as a beam-splitter with well defined properties, so it's affects on the image may be reduced by appropriate processing.
On the other hand, passing image detail above the Nyquist limit will cause artifacts. The problem is that if this artifacts show up in color we call them "moiré" and react, if they are monochrome no one complains but they are still there. Aliasing may even improve perceived sharpness.
A very good example is here:
http://a.img-dpreview.com/reviews/SigmaDP2...res_ACR-003.JPGAs you can see, there is a lot of false information in the image, but we don't react because we don't see colorful artifacts.
So, my point is that the issue is quite complex. Processing needs to be optimized for the image. Making objective comparisons is an illusion.
I may also point to this page that contains links to some excellent info from Zeiss, no easy read but worth the effort:
http://83.177.178.241/ekr/index.php/photoa...-and-perceptionBest regards
Erik
Care to elaborate?
Michael