Chelsea versus Real Madrid fixture is definitely a 50-50 chance but I am going to lean towards the side of Chelsea mainly because they are seems to have inculcate the winning mentality in the team even at the face of adversity, they have been playing well and winning games as if the club is not under pressure from the government and football organizations. I doubt if Real Madrid team is as strong mentally as Chelsea.
One of the games that are difficult to predict who will win because both are great teams and they both have a winning mentality. If we look at their performance in their respective leagues, Chelsea is slightly better than Real Madrid, which they have always won in their last 5 matches, while Madrid won 4 times and in their last match they had to lose to Barcelona. In the first leg, I think Chelsea will be slightly above Real Madrid because they are playing at home.