EMEX seats on the A380 are good, both in upper and lower decks. There is ample leg room even in the seat beside the door, as the chute is tucked farther back than the B747. Go early to the airport and request for EMEX seats as these are not available online for selection on OLCI.
I have flown on the A380 3 times already in Y. Frankly, I think the seats are not as comfy as the 747. Also, it seems everybody wants to fly on the A380, resulting in stressed crew, crowded toilets, and low probability of sitting next to an empty seat.
The plus point is of course the excellent AVOD and great picture quality on the LCD.