When the A380 was being developed I don’t believe anyone thought that airlines which operated Boeing aircraft would squeeze so many passengers into their twin-engined B777s and B787s.
The B777x will accommodate many passengers. But as we have explained previously Air Canada’s B777-300ER already accommodates 450-passengers in a three-class layout.
That is not far short of some A380 operators’ seating capacity.
Indeed Korean Airlines has equipped its three-class A380s with only 407 seats.