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Yep, on the microscopic scale the steel just doesn't hold it's shape and edge past .3 microns or so.

There is a document of sharpening experiments by a guy named Verhoeven in the archives, they...

The difference would be in how fine a stone you intend to finish on. Most cutting edges seem to max out at around .3 microns in width at the very edge, so the closer you can get to that figure and...