I've just taken hkg to jfk on cx840 on the new asias world city aircraft. I noticed a few differences compared to my J seats on the A330.

- the position of the tv and table are different relative to each other. On the a330 it was possible to open the table when the tv screen was fully extended. On the 777 this wasn't possible.

- there is now an Ethernet and USB port at each seat

- the seat seemed to be slightly less claustrophobic. Don't know if this was a real difference or just perception. I suspect the 777 seat was angled more to the front as it seemed easier to look out the window. Again it might have just been perception.

- the seat seemed longer. I don't know if its just because I pushed my head further back when sleeping but my feet definitely didn't touch the ottoman surround as much as on the a330.

- being a newer plane the seat seemed to be in better shape but that's prob just because of the newness

the high ceilings of the 777 certainly make a difference to the airiness and I think it is now my aircraft of choice.