Difference between 773 and 77W in economy?
It appears that the seat width and pitch is the same for both versions, but what about other things like IFE system (did they update the system), power options (the Air NZ webpage seat maps indicate that both versions have USB and power outlets, but SeatGuru doesn't show power outlets for the older version. But Seatguru is unreliable in general...), seat differences (seat cushion hardness), etc.?