Basically in all of my PCM1794A measurements I have seen something strange going on in the distortion figures between left and right channels. Right channel is constantly weaker but the results are very consistent between measurements, parts, and even different opamp models, while left channel shows better performance but the results are very inconsistent.
I will show few examples from different measurements. To be honest, I still do not know what is the root cause of these variations. While I was expecting my design and PCB to be the guilty one, I have seen the behaviour between different component and even different PCBs, it is inevitable that I start pointing my finger at the PCM1794A itself. But before drawing the final conclusion, I will still create a very simple and symmetric test board. However, now I will just present the results I have gathered so far.