My experience is:

QF5/6 is still affected by QF Engeneering strike. I have recently been on a flight to FRA that was deleyed by 16 hours (scheduled departure time from SIN 23.20, flight left at 15.20 on the following day). I think, I was the only 'revenue' passenger (hope to keep Platinum card, I have not accepted rebooking onto SQ nor AF), all other 5 or 6 passengers on the upper deck were QF employees (judging by the F/A performance).

So the fact, that they will make equipment change in SIN is a POSITIVE info. I guess, this will improve the on-time performance