I agree with you. Copenhagen has already proved their mettle. And after watching Copenhagen's performance against Bayern Munich, I feel there is no way to underestimate this team. This team has the ability to be confident and perform well against bigger teams.
Manchester City's performance is still a bit shaky. Due to their weak midfield, the team is not getting the expected performance from Haaland in attack. So the Copenhagen vs Manchester City match is likely to be competitive. However, if Haaland and De Bruyne play well, it will be a little easier for Manchester City to dominate the match.
Despite Manchester City's dismal performance, I don't believe Copenhagen will have a chance to triumph over them. Because they want to return with their best effort and win the game, Manchester City is now ready for the encounter. They will provide a remedy to Copenhagen Man City only have problem with midfield. Other than that, I have no doubts about their ability to perform effectively throughout the game.
However, there is also a noticeable gap between the two teams that will meet in the round of 16, although Copenhagen played well in the group stage, but it cannot be separated from the poor performance shown by their competitors, especially Manchester United.
I believe Manchester City will be able to get through this round, not having to create a lot of goals, winning with a thin score is enough for them. After all, Manchester City also certainly don't want to give up their defending champion status just like that, they definitely want to keep it.
There is a matchup between Leipzig and Real Madrid as well. Real Madrid are clearly the favourite side of it however we might see some good resistance from Leipzig especially in Germany. The first game is there as well by the way. Even getting a draw would make Leipzig happy I assume because they are facing one of the title favourites.
At the end of the day Carlo Ancelotti's Real Madrid should be able to show their quality by a solid win at Santiago Bernabeu. Leipzig don't have the capacity to eliminate such team after the group stage. It isn't like the group stage anymore. The favourites take it even more seriously after that stage ends.
Everyone will predict that this match will belong to Real Madrid and Leipzig certainly understands this very well so they will be able to play without pressure so they can continue to put pressure on their opponents, especially in the first match.
The match is still over a month away so Leipzig can prepare themselves well even though there will be changes to the current odds it doesn't look like it will be much different where Real Madrid will get quite attractive odds in the match around @1.85-@2.00, but bet on yes both teams to scores, In my opinion, would be better than choosing Real Madrid on the money line because after all Leipzig is not a weak team and the chance of holding a draw in the first match is for Leipzig.
Leipzig will play host first before they travel to Madrid to play the second match. It is no surprise when everyone says Real Madrid is the favorite in this match, because we know what kind of quality they are in the Champions League. But that doesn't mean we can underestimate Leipzig, because they will also play their best to get rid of Real Madrid.
At least they do not accept defeat and draw is enough in my opinion, in the second leg they can appear all out to win at home to Real Madrid. Or vice versa, they maximize home matches, in the second round they can focus more on defense.