from the Cathay website below
someone should tell CX they no longer have an F lounge in Bangkok
I remember they used to have an F and a C lounge opposite each other
Then the F lounge moved to the other concourse and became a C lounge also
The C presumably stands for Cr-p
and the food is on a par with Taipei F lounge for quality

Lounge
Cathay Pacific First and Business Class Lounge Bangkok

Concourse G, 3rd floor
Opening hours
Mon/Wed: 0530 - 1930
Thu/Sun: 0530 - 2200
Tue/Fri/Sat: 0530 - 0030
Concourse D, 3rd floor
Opening hours
Daily: 0530 - 1830 (closed between 1200 - 1300)