Like you, I think Manchester City beat Copenhagen, especially with Kevin De Bruyne back. His skills improve greatly. I'm planning for the quarterfinals and beyond. City is strong but not invincible. They'll likely beat Copenhagen, but Real Madrid and Bayern Munich will be tougher. Those games will show if City can win it all. Football is unpredictable. It's not enough to have top players like De Bruyne; it's how they play together under pressure. That will decide if they can win Champions League again
Beating Copenhagen is not a difficult task for Manchester City, especially if Guardiola can field his best squad, including De Bruyne in the starting XI he has compiled. Being of a higher class than Copenhagen gives Manchester City more freedom to dominate the match, the quality of Manchester City's attacks has increased since De Bruyne's presence, they will not be burdened even though the first leg is played at Copenhagen headquarters.
After entering the quarter-finals, the match will get tougher because the remaining clubs have almost the same strength, Bayern Munich and Real Madrid will continue to provide competition to reach the final round. Real Madrid is still able to appear consistently with its best performance. They are better prepared to face Manchester City, who eliminated them last season. The condition of the players really determines the success of the team, the coach must be more careful in arranging the line up in leagues which are not considered too important in order to maintain the fitness of the players in the UCL so that the team does not play under pressure.