Saying PSG is better this year than they were last year does not seem so true to me because performance recently is not as impressive as it were last season but they are actually not doing terribly they will definitely get much from this season, they will have a lot to contend with this session then they did last season so they will need even more effort to be able to do as much last season.
While I'm not worried about their performance in Ligue 1, they may have to work harder for the Champions League.
At least considering their performance at the start of this season, compared to PSG's performance at the start of last season, I agree with your opinion that their performance isn't as impressive as last season. But it's still early in the season, the competition is still going on, and we'll see if the competing teams can be consistent.
You have to be worried about PSG performance in Ligue1 also because they may be the best team in the league but if they start losing this early it will have a negative effect on the team and if they take the motivation to the champions league their opponents will have no fear when they play against them since they are not in good shape like they were last season that earned them the result of being the best time. Ther performance last season was much better than this season though it's still early to know when they will become by the end of the season but it you compare thei4 performance this season and last season it's obvious that last season is far better. They have to remain consistent in all competition if they wan to maintain the same energy of last season and not losing against any team in the chmpions league is what they must maintain.