I do have an excellent German copy and a Japanese copy. I think the German is the best I’ve heard.
MQA, as I understand it, is a DIGITAL technology not an analog format. I have heard it several times, (but never on my system). I was very impressed, but the music was not what I normally listen to, so it’s hard to judge. We’ll have to wait and see what music, (and how much) will actually be available with the MQA process, but IMHO, it could be a game changer.
It seems the proprietary owners of the process are closed mouth about exactly how it is done, and what the what to expect. in sound quality
Lots and lots have been written about MQA. They have been pretty upfront about how it works and what is needed to decode it. There are several very long "white papers" on the process. Almost every audiophile magazine has written about it and there have been numerous interviews with Bob Stuart and his team.