How tough of an opponent would PSG be for Barcelona in the UCL?

I'm not looking for generic answers like "we have to beat the best to win the Champions League" or "we shouldn't fear PSG." Instead, I want to discuss the actual tactical and strategic aspects of this potential matchup.

What should Barcelona be aware of? How do you see Barça matching up against a team that has recently hit top form, strengthened their squad with Kvaratskhelia, and has Dembele playing at his absolute best? Let’s break it down.