Barcelona has indeed performed very well in the LA Liga, but Barcelona has often performed poorly in the past few seasons due to financial factors and injuries to several players which have been the cause of their unlucky UCL. Looking at the current composition of players, Barcelona should be able to perform in the UCL better than last season where they were forced down to the Europa League. The presence of ilkay gundogan as a creative midfielder should be able to present a game that fans miss in their heyday like in 2015
If you saw Barcelona last season, of course Barcelona were in their era of financial crisis, but Barcelona was able to win the Laliga trophy with Xavi expertise in managing tactics with Barcelona last season. So this season, Barcelona finances have not recovered from the financial crisis they are experiencing, so they have difficulty bringing in players in this transfer window.
But still, Barcelona is still a pretty strong team in Laliga this season. However, their first start of the season failed to get any points as they drew against Getafe and Barcelona managed to overcome this to win again against Cadiz. I think Barcelona run this season is certainly more impressive than the previous season and hope that Lewandowski can end the problem of scoring goals in the upcoming matches.