Princess specifications:

wingspan 66,9 m
reference wing area 466 square m
planned MTOW 156,5 tons.

Sounds that Princess has a rather large wing loading and fast takeoff and cruise speed compared to other flying boats.

Brabazon and Princess found no market. But were the designs themselves technically sound? (Martin Mars never carried a ticketed passenger, but it still is fighting fires… could a Princess do the same if any were extant?)