Oh I'm quite sure cxorcist, with good info from the horses mouth to back it up. As Asteroid mentions, BA have a sale on at the moment which may be affecting the fares on the website, but as most of their J revenue on the route comes from corporate contracts the website tells barely any of the story.
BA didn't have to put an A380 on the route. They have plenty of other routes they could employ the aircraft on, but the fact that they decided to put a 25% increase in capacity on the HKG wouldn't support the notion that they were having the crap kicked out of them, either on pax or cargo (don't forget BA have the GSS contracted B748F out of HKG in addition to belly cargo on the 773 and 380).
LHR-HKG is about yield, not volume. Five years ago there were a lot more seats between the two on a daily basis and nobody was making much money as everybody fought for market share. There are just three operators left now that the fifth-freedom carriers have been pushed out and capacity constraint has helped the economics of the route. If CX want to bump up volumes on the route then that could be down to any number of things:
Genuinely making money on the route.
Trying to take market share and drive a competitor off.
Chasing volume over yield, Emirates-style.
Having nowhere else to employ spare capacity.
There's a lot more to it than saying "We've got five flights a day so we're winning".