Not exactly addressing the OP’s question, but this thread piqued my interest in doing a similar comparison. I thought the results might be of interest to others.
Source: Accuphase DP560
Alternate DACs: DAC30 (fed by coax spdif), DP560 (single ended analogue out via included Accuphase interconnects), DC801 (via HS-link, with output via balanced Cardas golden cross)
Each feeding into Accuphase E560 - Cardas golden cross biwire - proac response D38s
Perhaps unsurprisingly, each step up in (original) price yielded improvements in sound quality - mostly in terms of transparency and noise floor, but also with (consequent?) improvements in tone, soundstaging, attack and decay. Not that the differences were earth-shattering - I could live with any of them.
I also suspect that the quality of the transport may be a limiting factor - the DP560 as a transport sounds much better than my largely unmodified Mac mini (SSD, 16GB ram, Audirvana+, Weiss Minerva FireWire to spdif conversion), particularly in the upper registers. I suspect the differences I heard in the comparison using the DP560 as a transport would be much less if I used my Mac.