Cathay Pacific has been operating the A350 since June 2016. They already have 11 A350-900 aircraft in their fleet, with another 11 on order. On top of that, they have 26 A350-1000 aircraft on order. This will quickly join the 777-300ER as the backbone of their longhaul fleet.
From a passenger comfort standpoint, the A350 is probably my favorite plane after the A380. It’s incredibly quiet, typically has a tail camera, and the cabin is wider than on the 787.
As it stands, Cathay Pacific’s announced longhaul A350 destinations include Auckland, Christchurch, Dusseldorf, London Gatwick, Manchester, Melbourne, Paris, Rome, and Vancouver.