I ended up picking up the G7 and I love it. Audio blows me away, and really defies what I would expect out of a cell phone. I tried out my HD 6XXs and Massdrop Plus Universal IEMS, and both were driven perfectly be the phone. Detected them correctly, as they ended up being around the same volume (30-40 out of 75). I did a little back to back comparison of both of them on my Mimby-Jotunheim combo vs the G7 and left impressed. I didn't perfectly volume match, and I could tell which was which, but for a portable solution, I was amazed at how close the sound was. Only big negative I would bring up is the battery life. I am not a power user by any means, but I can easily see myself not lasting the day compared to my Note 8 when I never had a problem.
For those using the Quad DAC, what digital filter do you end up using/liking? I am typically a default setting, no EQ guy, so having to choose one of the filters is driving me a bit crazy.