Copenhagen is not a tough opponent for Manchester City, but it is also very important not to underestimate any opponent when any team starts competing again in the Champions League. Because here all teams will use any strategy to win and those who underestimate their opponents will usually not get anything, so it is very important for Manchester City to play well even though their opponent is Copenhagen because from that opponent Manchester City can advance to the next round. if you are able to win with a good enough score.
I doubt if Copenhagen will be able to make it beyond this stage in the champions league, Manchester city is a better team than they are both in strength and in their ability to be win the game against Copenhagen. Although Manchester city seem to be having some challenges recently but it's not such that will denied them a win against Copenhagen.
Knowing what is at stake at this stage of the champions league I know Copenhagen wouldn't make it an easy game for Manchester City as they will try all they can to see if they can possibly be able to get a point from every of the matches they will be playing in the group stage but then Manchester city has got all the experience and wouldn't want to at any point give Copenhagen such privilege because it will be to their detriment and they are also looking forward to winning the champions league again this season but then it's most likely they will win Copenhagen with tight margins.