What do you mean "soundwise"?
Motu 8 has 110db SINAD according to specs,you think you could distinguish it from a 80db SINAD or a 130db SINAD?
I think someone has to do the Klippel test.
While the Klippel Test is fun, I rely upon my own double-blind tests when evaluating gear.
In my studio and on headphones I could clearly distinguish between the 8A and the DX-7 Pro at the time of testing.
To discern a difference between the DM7 and the DX-7 Pro now is a tough job, indeed.
If all dacs (better than 80dB Sinad) would sound the same, why would anybody choose a decent Topping, Octo, Merging, DAD, Lynx, Prism, Rme etc. over a Behringer or the like?
Cognitive bias?
Having said that, in case somebody can´t distinguish between those dacs in their room, it definitely makes sense to choose a cheaper solution (while the DM7 is already crazy cheap for what it does).
If more people get interested in an 8 channel dac, we might see a DM7 with Adat in the future. Using that with an RME Digiface USB would be a dream come true!