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The amount of sharpness effect you'll see depends on the font you're using.
It's based on how the human eye perceives sharpness. When something looks blurry or out-of-focus to you, it's because the lines and edges are fuzzy, spread out in space and blending into each other. When something looks sharp, it's because there's high contrast at the lines and edges, changing quickly from dark to light (or vice-versa) instead of blending gradually. So to make something appear artificially "sharper" to your eyes, they simply increase the contrast of lines and edges, often exaggerating them to the point where there's a bright line on one side of the edge and a dark line on the other side. On the eInk screen it's a little bit more limited. All they can do is reduce or remove the grey blending pixels used for anti-aliasing the font.
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