I'm sure this is posted before but in the AF 2E-K lounge, don't go right! There are two entirely separate lounges in K, and the one on the right has no windows, the drinks are warm because there are too many people in there (who obviously don't know you can enter the other lounge on the left), and it's packed. Meanwhile you go left and you enter this nicely window lit two level lounge with way less people and cold drinks available everywhere. It's night and day experience.

I recently spent 6 hours in the AF 2F lounge, and slept a few hours in their quiet rooms. A very good experience and managed to sleep a few hours there.