I was watching this thread, and also looking at my Queen stockman's sheepsfoot blade. I'd thinned the edge on it a while back, using a Lansky diamond kit, and have periodically continued to refine the edge since then, using SiC and/or high-grit AlOx polishing film (over glass), following with CrO compound (on wood), then stropping on bare leather. The thing about D2 is, it'll do great with a high polish (or toothy, or anywhere in between), but it does take a LOOONNNNGGG time to first thin the grind, then make it polished while refining the apex at the same time. Sort of amazing steel, in that it continues to get finer & finer, but it absolutely demands patience in getting there. The large chromium carbides in the steel can still be abraded/filed/shaped with the rest of the matrix steel, but the key is using an abrasive that'll be aggressive enough to do it, even at small grit sizes. Otherwise, a less-capable abrasive will mostly just refine/polish the basic steel in the matrix (iron + carbon), without significantly reducing the carbide size at the apex. The blunter carbides left exposed at the edge will be the determining factor in how fine the finished edge will be.
David