I would like this to be a collection of data testing results and user experience with discussion and comparisons. To find the optimal steel composition at the optimal hardness, and optimal edge angle to produce the longest lasting fine edge. I would like to avoid discussing working edges in this thread as the main topic (Bring them up for comparisons but don't focus on them please) If I were searching for the worlds best as of 2021 in the ability to hold a fine shaving sharp edge, what steel at what HRC would we be talking about? (eg Shirogami, 65 HRC, 10 dps) I feel everybody these days is always doing tests and talking about working edge of high wear steels, thats great and all and I love me a bit of Vanadium in my folders like every other cardboard cutting enthusiast. What about absolute ability to hold the worlds longest fine edge? I'm the type of person who thinks his knife is dull if it fails the 3 finger test, and doesn't instantly feel the blade cutting into the first layer of skin upon a tiny soft drag. Or if my knife cant cut through paper towel I think it's time to hit the ceramic rods for a few passes. What is the ultimate top tier list for fine edge holding, top 5, top 10, data samples from 50? Anything and everything is welcome. How long did something last while just shaving hair, how long did something last while cutting abrasive material while still being shaving sharp. There's lots of different variables and I want to know them all. User experience is also highly welcome even if you dont have testing data recorded. Say you got a custom from a local smith who did a particular knife for you at some ridiculously high HRC and you noticed the grain was especially fine and could shave a mosquitos back hair for 3 years, I'd like to know that too. Cheers.