Let's not forget that Manchester City is the champions last season and they played against Real Madrid which is one of the best teams to have won the Champions more than any other team it's very bad not to see th as the favorite of the competition even though one of them will only qualify to the semi finals but it's possible to see the winning team between this two teams. In the league Both Manchester City and Real Madrid are doing very well but I think they will focus more on the champions league if they are sure dong your that they have secured their different league trophies.
But it was Manchester City's first trophy in the Champions League and it is not a guarantee that he will repeat the Champions League trophy again this season because Real Madrid have corrected their mistakes last season and will try as hard as possible to beat Manchester City in the quarter-finals this time because Real Madrid doesn't want to repeat the same mistakes that caused them to be eliminated from the Champions League. I believe Real Madrid will win their 15th Champions League title again.
Manchester City is focused on 3 competitions this season because they want to get the treble winner again, so their focus will be divided not only on the Champions League because in the Premier League itself, Manchester City's position is not completely comfortable because Liverpool and Arsenal are still in the hunt for the title as well as Manchester City who don't want to lose his dominance in the last few seasons.
Meanwhile, Real Madrid can focus more on the Champions League because its position at the top of the La Liga standings is quite safe because it has widened the gap with the clubs below it, so Real Madrid is not worried and Carlo Ancelotti will prepare a good strategy in this crucial match. I am very confident that Real Madrid will avenge their defeat last season.
Bro, I understand what you are trying to say, that real madrid have improved this season compared to last season, but their is no guarantee that they have made any corrections because they haven't played each other yet, and in that case, you wouldn't know what tactical correction that has been made in the team.
And as for having different focus, I don't think it's necessary because that is what bigger teams are used too, they just take it as it comes, though I won't deny the fact that Manchester city hasn't been their best form this season, but I really don't think, they are going to be an easy fixtures against real madrid, because this is the champions league, it's a competition of men, and Manchester city have all at their disposal, so you don't just rule them out like that.