lol you are funny. spyderco and zt use different ht. that video is not going to be the same for every knife let alone every brand.
here's more
https://www.bladeforums.com/threads...ed-on-edge-retention-cutting-5-8-rope.793481/
Not only is it in category 1 it does better than m390... The 20cv Michele Raymond is a custom with very very thin behind the edge .. Wouldn't really count that as a mass produced knife.
That all basically says its about the same. You should never base your opinions on just one data point of one knife.