Well, Divinity borrows heavily from Baldur's Gate I and II, which are available on iOS; Icewind Dale, the sequel, is coming very soon. You could also take a look at Knights of the Old Republic, another classic WRPG that features a huge world, complex character interactions, and deep gameplay (though it's not isometric like Divinity). These are older games, though, so don't expect modern production values like Divinity's. If you have an iPad, you can check out Avadon 1 & 2, and Avernum by Spiderweb Software, contemporary retro games that follow the Baldur's Gate tradition.
