Here's the link to youtube vid: Zubeng's Tamahahane knife: https://www.arizonacustomknives.com/knives-by-maker/zubeng.html Got the kiridashi a few weeks back and decided to do a cutting test vs one of my other fav knives. Anyway. Here are my thoughts - in short, the edge configuration was the only thing that allowed this small utility knife to very slightly edged over the kiri for slicing cardboard boxes. - however, as for cutting performance, both are on equal grounds. - Small utility is supposed to be Rc 62-64 - Kiridashi is in the low 50's - considering the ti kiri is heat treated to a softer hardness, the ti kiri was just as sharp, maybe slughtly less. - my thought is the kiri doesnt force its way through as well as the small utility. But I feel that's edge length and geometry. Perhap being slightly softer also makes impact. tho I suspect the last makes little difference. - thus, considering the vast difference in hardness, the ti kiri performed above its estimated performance level. - incidentally, the level of fine surface scratches were pretty much the same! Lol I pretty much copied and pasted my thoughts on it in a chat session. It's Sunday, so I get lazy.