Having just used the AF micro-adjustment to calibrate my lenses, both of which were quite far out, I can't imagine me ever being more accurate than AF.


Even 1 or 2 microadjustment points can make the difference between a pin-sharp and slightly soft image at wide apertures. Not only is it only possible to see that difference on a big screen (or magnified on the 5DII's screen) and IMO impossible to see through the viewfinder (with an AF screen), but even 10 microadjustment points (on a scale that goes from -20 to +20) is the equivalent of the tiniest movement of the MF ring. I just can't see me manual focusing with anywhere near that level of precision.