Hey, sharpest level?.... The hairs on your arms see the blade approaching, and just before the blade reaches them, they pop out of your skin and fall away rather than taking on that sharp blade. Oh, and the hair never grows back!
Yup, experienced that myself. But yeah, hair-popping sharpness is a real thing. Kinda wish I hadn't used my arms as a sharpness tester back in the 1990s.