I will be flying from SFO to HKG in business class on the new Airbus A350-900 this Dec.

1. Have the noise canceling headphones improved, or are the the same ones as before?

1a. I have an older set of Bose (QC15). Should I upgrade to Bose QC 35?

2. I've seen photos of the headphone input jack on the A350-900. It shows a two pin plug, with one slightly larger than the other. I'm assuming the larger one is for powering the headset's noise cancelling features.

If I wish to use my own headphones, will I need to bring one of those 'Airline Flight Adapters for Headphones', where it converts a dual-prong airline jack to a standard headphone stereo mini plug? Or will I be ok just plugging my headphones plug directly into the single (smaller) plug? What will give me the best audio quality?

thanks!