I must say I am glad I read these posts. I did not know carriers were now going to 10 abreast in the B777. Never come across that thank goodness but forewarned is definitely forearmed.
As for the B787, in Y it is a disaster from a passenger point of view. I've done 6 hours Bangkok to Muscat on Oman Air. Never again. Quite simply not enough room for an ordinary size bloke like me. So last January me and Mrs GDI flew to Miami on Virgin on a B787 in premium. She thought I was being fussy but went along with it. On boarding I told her to just try out a Y seat. She immediately agreed it was intolerable for a 10 hour flight.
Good to hear the new A350 is ok as I'm on a Bangkok to Heathrow Thai flight in Y.