Gald to see you're considering the Sony's based on your other posts. For the longest time, I would have agreed with you. The QCseries was a flat out market leader forever. But during all that time I always preferred a good earbud with a nice seal (usually athletic fits) over noise cancelling. I always preferred a good seal with uninterrupted sound vs bringing noise cancelling into the mix.
But then I tried to Sonys and I was surprised in the best way possible. I had such low expectations, and they were immediately shattered. Having said that, I haven't tried the new Bose 700 yet either. Also, admittedly I always had Sony studio closed back headphones growing up so I might have a bias towards their sound signature (even though they seemed to ignore it for a few years).
I still don't own the Sonys because frankly I don't travel much and I still have buds for when I do. But I still might move on the drop.com combo with the 6xx if it comes up and I decide to make an impulse purchase.