Hello there
Quick feedback (after 2 years and half of using it)
I have tested all I was able to test so far (headphones, IEM, setups) and to my taste DMP-Z1 paired with Abyss Diana TC is out of this world
(it is hard to describre, but when tears flow during a listening session (and you do not know why), it transports you into the extraordinary nature of music (as well as other expressive arts), it doesn't mean anything, but it's always difficult to put into words a feeling/an experience).
DMP-Z1 R-8/∞ heart is fully expressed (Direct Source,High Gain mode and Balanced 4.4mm Pentaconn output) every listening is joy.
Now as always it is as no value beyond adding one more personal feedback to this thread, only what you you will be listening associated with your taste make sense in the end.