Well, I am not surprised if the daytime YVR-HKG flight has the two class A340 service. In the past, F is full on CX 839 only during peak holiday seasons, but on low season, it is relatively empty.
But the good news is that CX is going to lease 15 Boeing 747-400s from BA in order to cover the future growth... CX is still not sure what to pick as its future long haul fleet... But some of the new leased Boeing 747-400 will be passenger version... so I assume that YVR will possibly get a second Boeing 747-400 service. A340s will concentrate on the thin routes like AMS, FCO, AKL, and YYZ, and used to explore other thinner long haul routes.
LAX flights are definitely not getting the new 2-class A340... Premium traffic is very healthy on this particular route.
Carfield