I have a "classic" Hock iron in my #5 and it holds an edge very well.
When I replaced the iron in #8, the local Woodcraft had a cryo, so I
tried it. It holds its edge very well also, but I'm not convinced
that the price difference was worth it.
It is obvious that the cryo is harder when honing, but I'm not noting
any substantial evidence of improved edge-holding.
It's much harder, and will hold an edge far longer. I hated it though. It's
much harder to lap and hone initially (several hours and a lot of elbow
grease). I prefer honing withouht having to think about it.I'll never get a
cryo blade again.
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