Quick update: I've used my Bose QC350 II on two long travels now and I can honestly say, they are the best things since sliced bread. The battery time is INSANE, the noise cancellation is superb, the sound quality is really good, the bluetooth connection almost flawless, the buttons are great except for one (play/pause) and the fit and comfort is amazing. Overall, I can highly recommend them.
My last trip lasted 30 hours and I had them om most of the time and when I was finally home I still had almost 20% battery time left. Also, neither my ears become hot nor did the headphones chafe on the head.