Thanks, picked up a set

Totally new to the world of high res audio but enjoying my music all over again. I have a Xperia Z5 and I listen to HR FLAC using a PHA-3 and Z7 headphones. Since I'm new to the game I am amazed at the improvements from lossy formats and mediocre headphones.   Is the ZX2 a major upgrade in...

I have the Xperia Z5 and use MDR-Z7 headphones and a PHA-3 amp. I have mostly 24/192 FLAC files. Would a ZX1 or ZX2 sound much better than the Z5 or just marginally better? I am trying to determine if I should invest in a dedicated player or continue using my phone. The setup as is sounds...