This has happened to me before. I was upgraded on a 788 into 1D and there's no overhead bin space above the seat. There was plenty of room in 1A if the guy moved his bag. The FA asked and he refused. So I then had to put my laptop bag over in row 5 for take off and landing. Maybe it was a cultural thing, but the guy in 1A looked offended when the FA asked - like someone just insulted his mother, wife, and child.