In the 2nd leg, he quite poor in the first half. He made a couple of very rash decisions that should have been punished but Bayern's final ball was poor. He did play well in the 2nd half though.
Bartra has shown that he has quality but I'm not certain he is able for the highest level. He's a good option to have as a back up but whether he'll ever make it as a starter for Barca, only time will tell. Personally I think he will be a very good centre back for a team challenging for Europa League spot or there about. Varane on the other hand has shown that he will be one of the best centre backs in the world for years to come.