My March 6th LAX-PVG flight was pretty empty in E+, 100% full in E- and almost empty in C, where I was - (sadly it was an old 777 config - waste of a GPU).

The FA's made a couple of announcements for E- not to jump into E+ in both languages. But one woman must of thought if it's not OK to go from E- to E+, it must be OK to jump from E- all the way to C (in my row on the opposite aisle seat). She must have been there for an hour before the FA realized and asked her for a boarding pass. First she played the "I don't speak English" card. No problem, the FA brought another Mandarin speaking FA to ask for her boarding pass, after several minutes of discussion between the woman and the Mandarin speaking FA, she got up and went back to E-. Later, the FAs told me what she said. At first the woman said "she lost her boarding pass", when the FA said she would have to move back to her original seat in E-. The woman complained she didn't want to get up because she had already been there for a while and the seat in C was "too comfortable" and that there were "so many empty seats, so it shouldn't matter" where she sat. Finally the FA gave her 3 choices, 1) Go back to her original seat, 2) pay $5000 for an upgrade, or 3) Be arrested upon landing at PVG for disrupting the flight. That got her to return to her seat in E-.