Yes, point proven again yesterday had back to back flights J on a 777 followed by PE. I had an obese guy sat next to me on the 777 (which isn't uncommon) who woke me up every time he unsuccessfully tried climbing over me. He was apologetic and obviously it wasn't his fault but window or aisle seat, you'll be disturbed either way if the other seat is taken.

Having done the flights back to back for a good comparison the difference in seat comfort is also worth pointing out. Whilst the seat pitch isnt comparable the 777 J seat feels like you are lay on concrete compared to the PE seat. Luckily for me all my upcoming flights are on a380s.