Exactly, Manchester City is not an appropriate opponent for Copenhagen especially now that Manchester City will played with a full squad because Kevin de Bruyne has recovered from injury so we will see a different game from Manchester City or we can call it Real Manchester City and I will say it's an easy win for Manchester City. This match will be played in February and there are still many moments to be passed but if Manchester City plays with the main squad then it doesn't have a way for Copenhagen to get points/win.
Sure, Man City should be superior against Copenhagen. Man City is the defending champion, they also have a better squad, and they are managed by an reputable coach. If we compare Man City and Copenhagen, Man City is a much better in any field. But we can't ignore that there is a chance for a surprise in UCL matches. Although Man City will play with full team, they may be not in their best condition. The players who just recover from injury, probably won't suddenly play with their best performance. Sometimes some players will get difficulty to perform in their best level after they get injury for a long time. So, I don't want to expect much for De Bruyne and Haaland.