I echo that JL cabins are HOT. Like, it's probably 80 degrees in there. I'm get cold easily when I sleep yet even I had to roll up the legs of the pajamas and leave my bare feet and lower legs sticking out from under the blanket. And the service on JL... their FA's English skills are often lacking. The food is pretty decent and lounges in NRT/HND are OK, but not as great as the CX or QF lounges.
CX is great, very consistent, amazing lounges in HKG... really can't go wrong.
QF F is amazing too. Not necessarily better than CX (it's very subjective), but amazing in its one way and unique. The food is the best I've ever had on a plane. Service is impeccable... and QF F is so rare to find as an award if I got my hands on another ticket I'd take it in a heartbeat.
I always tell people... QF F chooses you... not the other way around. If you find a QF F seat on the day you need to travel, that's a sign from the travel gods that you need to take it.