Arsenal vs Bayren Munich
This is a hard one to predict. They have been quite different from the last time they met. I'll bet on Bayren Munich as German playing style dominates over English.
We should better not look the way of history here because if we do, it will not be funny with Arsenal. As far as CL is concerned, Arsenal doesn't have any good record against Bayern Munich. It happened to to extent that during draws, Arsenal will pray that they shouldn't meet Bayern Munich but their prayers are never answered.
However, currently I feel that Arsenal team is more formidable than Bayern Munich.
Real Madrid vs Manchester City
This one too is going to be a great game. Again I believe the physical playing style of Real Madrid and their legacy on champions league would favor them over Manchester City,
I actually do not want to remember the last meeting between Real Madrid and Manchester City, it is scary on the side of Real Madrid.