Thanks for your response, project86,
It would of course be great to have the details about what kind of changes could account for the difference in performance, even though it's small. On the other hand, it doesn't seem like Questyle belongs to the kind of manufacturers that don't measure their equipment, or that do it poorly, specially with the kind of dedication they have invested on the design of the CMA800.
I think that the Benchmark DAC2 HGC would be a very logical addition to your very well written, argued and documented DAC reviews within the $2000 price range, and that you have covered so well, and have such close experience with. Also because it seems the most obvious contender of the DACs you've reviewed and in terms of measured performance and features. Like the Anedio D2, it sports similarly great measured performance, and a similarly great Headamp section, plus a bunch of other features for just $500 more (the Benchmark DAC2 D). I personally think you'd be THE person to review it, due to your close experience with such a great number of great performing DACs in the price range.
Another $2000 DAC I would also immediately suggest, would be the NAD M51, that has several interesting features, solid measured performance, technologies and design characteristics that would make it an interesting DAC to be introduced to your more thorough, detailed discussion and evaluation.
Cheers