Last season Real Madrid and Bayern Munich won most of their matches in the UEFA Champions League, and Bayern Munich even knocked out PSG, but when Bayern Munich and Real Madrid played Manchester City they couldn't perform well.
It's not that Bayern Munich and Real Madrid couldn't perform well when facing Manchester City, but because last season Bayern Munich and Real Madrid were not as good as Manchester City until Manchester City managed to get their first trophy in the Champions League last season. Meanwhile, PSG still hasn't experienced the beauty of winning the Champions League and the sweetness of a trophy in the Champions League, but this season I'm still not sure that Manchester City can repeat the same thing.