I really do not know first hand.
A friend of mine, deep in electronics, told me that R2R dacs can have sample to sample differences in the resistor rails.
Based on measurements, in the audible zone both the D70S and the Pegasus should sound the same. But, then, the Pegasus somewhat smoothes out small details, which are less “present” than in D70S: rock tracks sound less engaging compared to the D70S, for example.
Or, another easy to spot issue, with some female voices, the Pegasus somewhat took out the “tone” part and left intact the “air” part of the voice emission, giving a sort of “disembodied”, or “sucked in” character to the singer. With some male voices, that worked fine, though.
Lower treble in the Pegasus had a perceptible roll-off, resulting in less sibilants compared to the D70S.
I do not know either if that is due to the high output impedance of the Pegasus (1250 Ohm according to various sources). My MBL pre has a 50.000 Ohm input impedance, which should work fine. But, still, it’s conjecture.