Nanaholic
Excellent and very extensive and thorough review. I am in a similar situation to you as I own the E8's, have had the new Sony's for two weeks, and also have the B&O H9i for airplane use.
I am really on the fence with the Sony's. They have been packed up for return to Amazon, opened up again to try, and are still sitting out perhaps ready to be packed up again for return.
I am very happy with the sound - more so than my E8's. My sole use for the Sony's is to bring them on flights instead of the H9i's (small form factor). While I have not had the opportunity to try them out on a flight - my trials with them at home (dryer, dishwashing machine etc.) seem to indicate the ANC being a bit meh. Perhaps the constant drone of an airline engine will allow the ANC to function better?
The biggest thing for me is comfort. I just cannot seem to find the magic key. All of the included buds left me unhappy. I tried the Comply T200 foam tips from my E8's - and still was not happy with comfort. I then tried my Spinfit CP100's (from my E8's) and they fit better - however still uncomfortable.
The Sony's were then boxed up and labeled to go back to Amazon. At the last moment I unboxed them one last time and, based on this thread, ordered the Spinfit CP360's. This time I ordered a medium and small (I use medium for my E8's).
Still not happy with the comfort - and the seal.
What to do??? I think the Sony's sound better than the E8's - however the B&O H9i's sound even better still - and the ANC appears to work better. The problem is I would love to carry the Sony's onto the airplane instead of big over the ear H9i's!