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There's a couple rabbit holes there you're digging into.

Natural stones: Coticules, Thuringians, Eschers, Japanese Naturals (JNat), Arkansas Hones, Jasper, modern types (Apaches, etc.), etc. etc....

So... I think that's very subjective (also not precisely what RezDog said). I could not get what I would consider a close comfortable shave off a 1K for sure. At 4K I expect smooth shaving with the...