I went on an A330-200 in J from MAN-DXB and back in J on a 777-300ER....the A330 seat was narrow but it does have stacks of legroom to compensate, meaning that you can recline it right back and still squeeze out past the person in the adjacent seat without disturbing them. I am a big bloke (6' 3" and heavier than I care to admit on this forum!) and the A330 seat was tight but not uncomfortably so. However, I was expecting the 777 seat to be miles better than the A330 one but it wasn't. The main disappointment with the A330 versus the 777 I was on was the IFE.