I think a lot of us on here are quite spoiled by flying in premium cabins. Flying Y in long haul is simply not fun, but in a strange way the OP may have lucked out with the old 777, given that it is a bit roomier. I have flown a BA350 in Y and was pretty uncomfortable. I also flew on QR in Y and had a rather large chap sat next to me. Game over- it was truly horrific.