Someone postet measurements here that looked pretty bad/average.
I just noticed, that this guys measured the WM1ZM2 in the worst case scenario (120/120 Volume on High-Gain).
It is important to notice that, if you lower the volume, you increase the quality by a _lot_.
Unlike with analog amps where you decrease the sound quality when you lower the volume
The measurments at realistic listening volumes looks very different.
Also he failed to measure the difference between input and output signal. In general, analog amps modify the input signal much more than digital amps to (which causes the often called "Soft" Sound of Analog amps).
So if he would have done measurements at realistic listening levels, the measurements would have looked significantly better.
The measurements are not wrong. If you are listening at 100% Volume High Gain, an Digital Amp performs worse than an analog amp. But this is an unrealistic scenario.