This season, Messi has performed well compared to Ronaldo. he has always been a determining factor in SPG's victory, even though he didn't always score. his contribution as a playmaker has made SPG too strong for their opponents in Ligue 1. he is a smart player, even though he is no longer young. however, the talent he had did not disappear. currently all leagues have stopped due to the world cup break, and I hope Messi will give his best game with Argentina in the world cup championship later.
Compare to himself first, he actually has better performance than what he did in the past season. Compares to Ronaldo, Messi have better appearances and better performance than Ronaldo. It lasts from clubs to national teams for two players. This season is totally disappointed for Ronaldo but he still has World Cup to fight.
after the world cup was over, the last 16 of the champions league started again. and PSG will meet equally strong opponents, it will not be easy for PSG to overthrow Bayern Munich even though PSG has the advantage of playing as the home team in the first leg. IMO, the round of 16 will be the real test for PSG against Bayern Munich later.
PSG is strong but is Bayern Munich - their opponent - weak or weaker than PSG?
Bayern is weaker than a few seasons ago when they won Champions League but they are at same level of PSG. I can not pick what team will win after two matches. Maybe I don't make any prediction here, just wait for their matches and enjoy.
PSG will have to see how Messi comes back after World Cup as they need his best. This season, Messi becomes more important for PSG as we saw that in matches without Messi, PSG attacking system is very boring and has less powerful attack.