I would like to mention that Buck uses the supervision of the famous heat treater, Paul Bos, which probably accounts for the great heat treat of their 420 HC and others.
The Cabala's Alaskan Guide 110 is made with CPM S30V and it is stamped with the bos logo. It costs about twice what the regular 110 one does. Cabala claims this blade ( S30V ) holds an edge 45% longer than 420 HC. The few knives that I have made, with S30V, were heat treated by Paul Bos, and their performance has been just great!