I'm fairly certain that all the Club World product seats are identical, the two exceptions being the A321 midhaul and A318 Babybus. So A380, 777, 747, 787 are all the same, it is the same seat on an adapted chassis in all of them. It is narrower at shoulder level than some airlines, bit wider at the lower end compared to some airlines, there isn't the "foot coffin". Some seats are nominally longer than others due to a lack of a neighbouring seat, however. Unless you are over 100cm/40 inch waist, over 2 metres/ 6 ft 4 inches or an All Black you're unlikely to have a big problem here. (And All Black players have flown CW and survived the experience, now I think about it).