i didnt know that CX crew overnighted in Singapore - always thought they were a turnaround (and most crew confirmed so). maybe things have changed? Once though I saw a new crew deadheading to Singapore to operate the return turnaround as the existing crew was out of hours due to a 4hr+ delay.
After flying this route in Y (sadly) too much.. must say the T4 is annoying to get to on public transport, otherwise all great. Oh another complaint - the A359 always gets a very high gate on arrival at HKG! means longer walks to clear immigration!
Crew mostly good, but I have found some non-HKG ones a bit hit and miss. Was talking to the golden lady (FP?) - she said this route is a bit more demanding given the higher level of elites - she said people expect a better service (but maybe she was a Japanese FP with higher service standards).