THE only knife I have ever had rust from siting stored was an A2 knife but it was not heat treated by ME so I cant say that it was done correctly. I think thats why it rusted from sitting even if it was oiled and put up correctly. It was a very well known companies knife that makes many knives and I have heard that teh heat treat on some has been off on a few at times.
in my opinion and its just an opinion I dont think A2 is that much more rust resistant over 0-1 but I do find it more stain resistant.
I always go back to 0-1 as its an awsome user steel and I like D2 for a more stain/rust friendly knife.