Did Real Madrid Deserves The Penalty ?

The penalty for Marcelo, which got executed by Ronaldo, has made a controversy. Barcelona players made a protest that it didn't deserves a penalty. Dani Alves claimed that he touches the ball first before it hits Marcelo's feet. Xavi said after the match, that Barcelona is better than Real Madrid.Judging on this match only, I can say I agree with him. And what about  the penalty ? The incident