Actually this doesn't quantify sharpness, for that you need a really good microscope. This quantifies the ability to break fiber.

Gillette and Schick use polymers to reduce the friction so that the edge cuts easier. Almost all of us use water and soap to change the properties of the hair so that it breaks easier.
When you start breaking down the process of shaving the sharpness of the razor is one of the less important factors.

And as far as quantification goes, if you venture to other forums and ebay you'd be surprised how advanced some people are at quantifying it.

This razor is honed up to 15000/30000/40000/50000/60000 grit, therefore it provides the best possible shave.
Interestingly enough a sentence like this tells me everything I want to know about that honester, so I guess for me it works really well.