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The F and UF are different densities/hones. The difference goes well beyond surface finish. Tap each and hear the difference. I've heard that they are fired differently and have a different mix of...

Spyderco's guarantee is +/- 0.020" over the entire surface (unless they've changed it recently). This means over 8 inches, or, in theory, even over 1 inch or less. Visualize 2 parallel lines...