Knife sharpness is demonstrated from around 1:30 to 2 minutes. I also found the rest of this video interesting.
Bon appetit!
https://youtu.be/x-SJATl3GgY
Ken
Interesting video. I use sound a lot when cooking to make sure I am doing it right.
Also, I notice that the sound of the paper test also tells you about sharpness. The sharper a knife is the more silky the sound is. A sharper knife will also make less sound in the paper test.
Interesting observation, John.
Ken