I do not have direct experience with it, though I have read a good bit about it and it certainly seems to have promise. Out of the steels you list, it'll have a lot more in common with BG-42, S30V and the other high-end stainlesses than it will with 440A and 420HC. This family of steels is just starting to really grab the market here, so time will tell if they turn out to be as high-performing as they are advertised as being, but the initial impressions seem to be very good.