Hes achieved everything, maybe he just feels its the right time, his role in the squad has diminished with the new set-up and he is still a world class player in the right set up
Grass isn't always greener, but even if his Bayern stay isn't that successful I doubt he'll care, he's got a hall of fame career already
Longer contract in a new, and nice, City in a league that he'll walk to the title
Sad to see him go, is a bit concerning how many big characters and long time servants we'll be losing in a single window