The airline with the best average rating is Lufthansa with 7.4/10.
The average flight time is 10 hours and 55 minutes.More information
Munich Airport doesn't seem to have free water, I asked 3 members of staff and walked up and down the terminal twice. Hong Kong Immigration is usually easy. One time in a queue of 6 people (probably 6 officers too) I got through in 1 minute 30 seconds from entering the line to exiting