I've read that too that s30v doesn't mirror polish well..didn't think about the reason why just figured makers know what they doing.From what I’ve read that s30v doesn’t mirror polish as nicely as 420hc, s35vn and others. The carbides in s30v are larger and it has a blotchy appearance when mirror polished. The edge can be honed to a nice mirror shine but it will still have a micro toothy apex.