I had the SGCD and am testing the SG DAC and comparing it to the DSD MK2, but have only had the DSD in my system for a few days now, so am reluctant to comment there.
I can say there really is no comparison between the SGDC and the new SG DAC, which is far better. Dead quiet, precise, more open than the SGCD.
If you didn’t see Chris Brunhaver’s comments, they might be of interest.