Actually, for *A it's a great airport if in LH F. (or connecting to/from LX F)

I also fly often out of T-2 w EK and that terminal is very easy (similar to MUC) and the EK lounge is just as good as the LH F lounge

As far as UA goes, you should expect to find a lounge thats sub par to go along w the F service (also sub par). Probably the only place system wide UA has the use of a truly great lounge in F is in BKK where I'm surprised TG allows admittance in the F lounge which is a great place

The actual UA FCL in HKG is actually also a nice F lounge in the same league as other F lounges.