While we can't know EK's in-house numbers, we certainly know their moves.
We also know they have just posted a USD$600 million first half profit.
The question for CX is as before, how much volume is left over in the fwd and aft cargo of an A380 with a full load of pax?
It would depend on how it is configured. In planning they would look at 2-3 containers per equivalent aircraft (EQA=145 seat aircraft). The A380 would be 3 EQA, or between 6-9 containers for baggage. Rounding that up to 10 containers would leave 26-28 LD3 containers, or 8-9 pallets of space in the hold after passenger baggage. A typical configuration would be 8 LD3-AKE containers and 4 pallets in the forward hold, and 6 containers and 3 pallets in the aft hold. Each empty container/pallet has a weight of around 100 kg minimum.
In comparison the total available on the CX 744 without baggage is 30 LD3-AKE containers or 9 pallets, the 77W is 44 LD3-AKE containers or 14 pallets.