A few notes on perception of sharpness.
The idea was put forth the contrast has a significant effect on apparent sharpness. This is right on and I believe is probably the main effect Arash is seeing. The basic proof of this concept is that fact that people call unsharp mask sharpening. Not only does unsharp mask not sharpen at all, but it in many (most?) cases reduces sharpness! Unsharp mask gives the illusion of sharpening by increasing edge contrast. This is called accutance.
I'll refere people the the "
Important Sharpening Information!" thread:
http://www.birdphotographers.net/for...ng+information
Similar effects are likely happening in LCD displays, decisions different manufacturers has decided in the manufacture of their monitor, and then modified by users of those monitors by adjusting contrast.
The different in dot-pitch between monitors, whether LCD or CRT is small in comparison to the contrast effects.
Roger