Benchmade used to make a Griptillian in D2 (I think it was a Cabela’s exclusive). There are also the Ka-Bar Doziers that have already been mentioned. There aren’t a lot of folders being made in D2 (I think the reason is that it’s difficult to properly heat treat. Dozier is known as the expert in heat treating D2).
There is a lot of other variables that go into the performance of a knife blade other that the blade steel. Heat treat, edge geometry, and blade grind are all contributing factors. Buck’s 420HC (normally used on the 110, unless you custom order it) is a great example. It’s got very good edge retention. Another great example is the Boker Plus Subcom Folder (the original 420 SS version). The blade steel was 420, but it performed as well or better than some of the premium steel. People who actually tried that blade (including myself (were pleasantly surprised by it’s performance).
There are a lot of good, premium steels out there. 154CM, S30V, ATS-34, ATS-55, VG-10, ZDP-189. All are good. While I do own 154CM, S30V, and VG-10, I’ve only used VG-10. I like VG-10 because it’s easy to sharpen, yet is excellent at holding an edge. This has been with VG-10 knives from two different companies (although that doesn’t mean it’s a different manufacture).
I’ve heard a lot of people say that S30V is hard to sharpen. I’ve also heard people of the Queen subforum over at knifeforums say that D2 is hard to sharpen (think diamond hones). I haven’t tried S30V, so can’t speak on that. However, I have sharpened my Queen, and it is tough.
Can't go wrong with a Spyderco or Benchmade, although Spyderco's are a little less $$$.