More observations on T4:

1/ It is a beautiful terminal. Given the low volumes, felt like a VIP terminal (but this will undoubtedly change once more airlines move across)

2/ The CX aerobridges are all the way at one end of the terminal from immigration / lounge. It's a long walk (my estimation its like the Wing to say the high 20s gate at HKIA?) with 2 travellators - and you are guaranteed to get this all the time. I wonder why they could not design the aerobridges to be nearer the immigration terminals and make your full-service airline customers walk less.

3/ They could do with more manual counters as there was a queue forming when i visited during Sunday PM

Still for CX O/D passengers, i think T4 is ok. Connecting to / from T1 C gates on those QF itineraries would be a royal pain... (e.g. PER-SIN on QF, and then SIN-HKG on CX)