Carnival owns Cunard and it is the infussion of Carnival money which has made the QM2 and the upcoming Victoria possible. However, Carnical maintains an almost non-existent on the Cunard ships. QE2 staff members with whom I have spoken agree that Carnival saved Cunard and has been good for Cunard.
by the way, remember that ANY carnival group ship qualifies you for the "previous cruiser" status on any other. thus you qualify for past cruiser status on cunard or even seybourn if you have been on a carnival, princess or any other group ship.