Bayern vs Chelsea: In my opinion, Chelsea will win because they have a stronger squad than Bayern. Of course, Bayern will put up a strong fight against Chelsea, but I think Chelsea will win. Chelsea, as the team that recently won the Club World Cup, will undoubtedly have great ambitions to win the Champions League trophy by continuing to win in the Champions League. It seems I will favor Chelsea in the betting for that match.
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Do they? In my opinion, Bayern's squad is definitely not weaker + they play at home. I wouldn't risk a cash bet on Chelsea, although the odds probably make up for the risk, here's what the bookies think of the game at the moment:
1.73 - 4.16 - 4.26
As you can see Bayern are considered big favourites and Chelsea's win would be considered a big surprise. I don't think Chelsea will spring surprises in international games time after time (the last game was against PSG).