I am 6ft@ 280lbs. I fit comfortably in my CX-5. The only complaint I do have is that the seat sits up high off of the floor, so for me, its like sitting in a chair when I am driving. I kind of wish the seats were a big lower, but it is what it is.
Not sure about the sport, the power seat version can lower it a surprising amount. Far lower than most suv's...feels like sitting in a car.