SWTOR: 1 new planet, 5 new levels
WoW: 1 new continent, 5 new levels
Umm... You were saying?
You must have meant that MoP also brought with it a new race, new class, new raids, and more. . .
Granted, you ended up not actually needing to purchase MoP for the race or class, though. That's right . . . you got it FOR FREE just for playing the game. Wow . . . imagine that!
Sorry, can't compare here to WoW. Not by a long shot. And I generally dislike WoW, to boot.