TT, here is a quote from the FAQ posted at the top:
"D-2 is sometimes called a "semi-stainless". It has a fairly high chrome content (12%), but not high enough to classify it as stainless. It is more stain resistant than the carbon steels mentioned above, however. It has excellent edge holding, but may be a little less tough than some of the steels mentioned above. And it does not take a beautiful finish. Bob Dozier uses D-2."
I have never owned a Wilson model. I can tell you that there is an old adage among knife makers that says: "D2 takes a lousy edge and holds it forever." However, I have handled a few Dozier knives and they seem plenty sharp to me. D2 has excellent edge retention, but may be a bit more prone to chipping or breaking if subjected to abuse. It works very well for smaller blades, especially hunters, skinners and small tactical knives, 4" - 5" or less. However, IMHO, I would look at other steels for large knives. For the Wilson you mention, I think D2 is a fine choice for steel.