I agree with some of this. While it does vary, Chinese D2 just doesn't seem to give me all that much over 9Cr18Mov, N690, 14C28N, Nitro-V, 154CM, etc. on edge retention. Of course, all of those steels are more stainless (especially the first three).
So the way I look at it, D2 comes with a tradeoff. The corrosion resistance is low enough to make it a three-season steel for me. (Stretches of 90F with 90% humidity means sweat and my sweat will spot D2.) So when D2 is up against any of those other choices for carry, I have to ask what I'd be getting for the trade. In theory, the answer should be "much better edge retention" and that's been the rub with Chinese D2.
BTW, a particularly good example of D2 with that convex edge might be making up the difference. How far out do you take it on grit?