No, I haven't. While optimal MQA may be stellar, I am not sure if what you heard is representative of the average result from the format. Reviews seem to be mixed.
I do not plan to bother with MQA as long as it remains a fringe format -- which it will. I also didn't bother with SACD because I predicted that it would remain a fringe format, which it did. I am glad I didn't put time, money and effort into the format. And in the meantime, plain CD has become so much better than it was at the introduction of SACD that I am seriously wondering how much, from a pure sound quality standpoint, involvement with SACD would have been worth it.
As for being interested in MQA because it brings you much closer to analog: the Yggy also brings me astonishingly close to the life-like realism of analog -- on Redbook CD. While you may reply, "wait until you have heard MQA so that you know what I am talking about", I'd say in return, "wait until you have heard the Yggdrasil DAC so that you know what I am talking about". Unfortunately, we cannot instantly swap each other's experiences.
Precisely my point.