Sorry Ive come into this thread with the luxury of being late. Have been in the Delays thread which discussed the same issue.
VHOQJ which was flying the QF9 route when it turned around was replaced by VHOQL in SYD allowing a quicker turnaround than replacing an engine
An Emergency?. An aircraft which has to shut down the 4th is not necessarily in an emergency situation as JB747 has alluded to. Nonetheless it was prudent to return to base. Flying to DXB with 3 engines would be range limiting and not very smart even if the computer says range is ok.
Luckily for QF, there was no scheduled QF7/8 on Tuesday 5 April (thanks Melburnian1) and QF127 is a 744. So the only A380 operating are QF1,2,9,10,11,12,93,94. With one generally in maintenance there would be 2 A380 sitting somewhere. The A380 bases are SYD and MEL. Maybe there was one "shovel ready' A380 in SYD and the presence of a spare A380 at SYD would have been part of the decision to divert there. Additionally SYD has mainatenance facilities for the A380
Again poor journalism. The fact that an airplane has to divert and land does not make it an emergency. If it was an emergency it would have landed at the nearest capable runway.
I would think the F,J,WP,WP1,CL,SG passengers would have 2 lounge experiences - a dinner, excellent cabin service for those lucky enough to be in the pointy end (caveat below), and then a breakfast with showers/spa in SYD. I feel sorry for the Steerage passengers. They would be extending their non shower status by at least 12 hours.
JB747 or other pilots: in such a engine problem scenario would the seat belt sign come on when problem was detected until landing which would eliminate any possibility of meaningful cabin service.
Correction: QF9 engine vibration above norms does not mean the pilots had to shut it down. Journalist like error....