Svord is L6 carbon steel. It is a basic low alloy tool steel. It doesn't really have any specific carbide forming alloys added so will have the same edge holding as the equivelent simple carbon steel (Although will be a bit tougher due to the added nickel, a function not super important in a hunting knife, simple carbon steels are allready very tough due to fine carbides).
L6 is around 0.7% carbon, and the steel Viper uses is 1084 which is 0.8-0.84% carbon, so his steel will have a bit better edge retention at a given hardness.
The Svord knives are very soft, usually around RC 56, Viper, assuming a standard custom Hest treat protocol for. 1084 is probably somthing in the realm of 59-60rc, quite a lot harder.
In short vipers and most custom knife makers simple carbon steels will eclipse a knife like a Svord.
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