I agree with you that Real Madrid against Bayern Leverkusen is going to be an interesting match because both teams have a lot in common in terms of how they play and how they never give up. I'm curious to see how the match will proceed because without thinking twice, Real Madrid seems to be the one at advantage to win, Bayern Leverkusen knows this and will try their best to prove a point. If Madrid underestimate Bayern Leverkusen in that match, they might be shocked at the outcome of the match.
I think it will be more interesting if Real Madrid will play against Atletico Madrid. It is because Atletico Madrid knows well Real Madrid. And the match Real Madrid vs Atletico Madrid always becomes a tight match. When Real Madrid vs Leverkusen, I think it will be easier for Real Madrid. Leverkusen attackers look like not really difficult for Real Madrid defense.