I think I read this somewhere one time that some people set their cameras to 0 for sharpness to make it easier to tell if the shot is actually in focus or not on the LCD. Similar to how you get a focussing screen without the tiny micro lenses which make it look sharper than it really is. Is there any weight to this at all? Of course in post you can set it to whatever you actually want.
Canon 5D Mark II, 50D, XSi, 24-105L IS, Sigma 35 1.4, Canon 40 2.8, Canon 35 2.0, Sigma 10-20, Tamron 17-50, Canon 50 1.8, 580 EXII, 430 EXII