I think that it will be still very much interesting to watch if Real Madrid gets eliminated.They barely managed to qualify against a much weaker Leipzig so if they keep playing like that against City it simply means that they will have a very hard time during such game and most likely they won't come victorious from this encounter.
I don't think Real Madrid is better than last year,quite the opposite I would say and how bad it looks now on Ancelotti that he said no to Mbappe some months ago,he is a player that can make a difference.
Real Madrid's return match against Leipzig was indeed difficult, but it must be remembered that a draw was enough for them to achieve a satisfactory result, and they achieved it. City will definitely be a more difficult opponent than Leipzig, and I do not rule out that for Real it could all end in the quarterfinals. However, these are too strong teams to be confident in any outcome, in a confrontation between such teams, even the factor of luck will be of no small importance.