RCCL's new ships in their largest class are always "the world's largest cruise ship". Harmony is probably a few inches longer or a few pounds heavier than her sister Oasis of the Seas, which calls next week. Passenger load is the same. So while the headline is dramatic, you can get a preview next Wednesday. Luckily she's the only ship scheduled on Wednesday, so her 5,400 passengers will have the island all to themselves!