Right, here's my opinion on the 9 clubs you mention above.
Barca - undoubtedly the best team in the world.
Real - still ahead of us, but other than Ronaldo I don't see their squad being that much better than us, they are definitely in decline.
Munich - still ahead of us, they just have more experience in big games, we'll catch them soon enough.
Chelsea - they were ahead of us last year by quite a distance, but a poor transfer window for them has shown, we dominated them 3-0, it could have been 5/6 ahead at half time!
Athletico - they have some good technical players and arguably the best manager in the world (despite playing boring football), but they aren't the team they were 2 years ago, to many good players have left - I think we're ahead of them.
Chelsea - they got mentioned twice in your list
PSG - Really good team, I'd say they are 'just' ahead of us because they don't have any domestic competition.
Juventus - absolutely no chance are they ahead of us now. last season, maybe, but they've lost 3 of their 4 best players and domestic competition has improved.
Dortmund - No Klopp, no champions league football, no Lewandowski - they are no where near the Dortmund of 2013 and arguing they're ahead of us is laughable, there are at least 4 teams ahead of them in Germany alone!
I think a lot of City fans forget that in the last 2 seasons we've been in a group with Bayern and faced Barca in the round of 16. Juventus last year had a group of Athletico, Olympiakos and Malmo (they finished second), they beat the poorest Dortmund team we've seen in half a decade to reach the quarters, where they beat a Monaco side that finished 12 points behind PSG - they qualified for the final after having the game of their lives vs Madrid - then played Barca in the final and got outclassed on every front - and people think they had some incredible team that was miles ahead of ours etc - they didn't they just got lucky one season.