Barcelona still hasn't shown a convincing performance, the victory this time was quite helped because of the penalty prize, and fortunately, Lewandowski managed to execute the penalty well, the previous match they also almost lost to Villareal because they were behind by the home team, and it looks like they are having quite a problem in the away game because from 3 away matches they have had difficulties if Xavi Hernandez hard to finds their weak points and fixes them immediately then Real Madrid will be very comfortable staying at the top.
I think they haven't got hot for the new season. If this continues then Barcelona will lose a lot of points. They will find it difficult to chase points if the difference in points will be even more.
I think with a good enough transfer from Real Madrid they will be favourites to win again. Although it is only the initial season, Xavi must immediately improve it. Xavi must maximise the potential of players to get maximum results.