That doesn't strike me as a particularly apt comparison. In terms of sheer scale, these games are very different animals. And Zelda dungeons are, with very few exceptions, not exactly complex, or even particularly deep; they aren't bad, but they're pretty simple overall.
its not only world size.
All the things you can do in zelda . Example Skyward sword:Flying, swimming, diving, diging unter the earth, driving boat, driving minekart and much more.Thats compareable to an gta (where you can fly, swim, etc).Annual games in general doesnt have this freedom.