CX HKG LHR. Same day. 744 vs 773. Same route (B330) and time ( I asked the planners for a comparison). Almost identical pax loads. In other words apples v apples
A CX 744 carries 80 more pax than a CX 773ER.
So if you want to carry the same number of pax you'll have to put a 5th daily service on. The 777 is obviously the better machine but when they need bums on seats CX has no choice but the 744.
So it's more like 'apple -80 vs apple'.
What are the figures for the A340 v the 773ER?