Looks really intriguing. I was more of a fan of the Mate 9 but noticed that sound quality was said to be on the mediocre side. I also couldn't help but notice that the V20 had a Quad DAC & that the G6 would be getting one as well.
Don't look for the DAC upgrade to be measurable except on paper. The V20 DAC is already a beast, but for marketing purposes that have to claim an improvement.