You are misunderstanding the Chinese steel nomenclature.
"MoV" means that there might be some molybdenum and there might be some vanadium. There is no requirement that those elements be there. And if they are, there are no controls over the amounts.
Since there is no actual industry specification for "420HC" the composition will vary depending non the source of the steeel.
420HC might have Vanadium in it, but it might not. It depends on the source.
Latrobe 420HC contains .3% Vanadium. A lot of other mills don't add Vanadium.
Here's a data sheet from Allegheny Technologies, a major US mill. Their version of 420HC has no Vanadium, but might contain some nickel (note the asterisks and the note below the table. Nominal Carbon content is 0.44%):
https://www.atimetals.com/Products/.../ati_410_420_425_mod_440a_440c_tds_en1_v2.pdf
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Here's a product data sheet from ThyssenKrupp. One of the alloys covered is 4034
https://app.aws.org/mwf/attachments/1/56901/nirosta-und-thermax-GB.pdf
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So, at the end of the day, Cold Steel is essentially using 420HC purchased from ThyssenKrupp as 4034.
I agree with the other comments. 420HC is quite a difference from A2, O1, or Carbon V.
And for a large tough knife, SK5 would be a lot better.