Keep in mind D2 doesn't take a patina, it tends to pit when exposed to acids.
-- Sam
I have to disagree with you there. I've got four Queen knives in D2 with Patina. It takes longer, but it does happen. Three of them came by it naturally from cutting up fruits, vegetables and meats. The fourth has a vinegar induced patina. I wasn't happy with the way the patina was developing on that one. I'll try and get some pictures up tomorrow if I can get some good ones. My photography skills are lacking and the wife is going to be too busy to help.
As to pitting, they do pit easier than CV. CV, in my experience, devolps rust on the surface well before pitting. So, unless you leave it stuck away somewhere for a good while, you can remove the rust before pitting occurs. D2, in my experience, can sometimes pit without warning. For instance, cutting up meat, not cleaning it well enough (thought I did), then finding some light pitting the next morning. That said, I haven't had any bad pitting on any of my D2 knives. Even though it pits easier, it doesn't seem to pit as badly.
Leo