Firstly, I thought the apology was as bad as the service they provided on that flight. They were inattentive, and we were treated like we were in economy and an inconvenience, not a customer. I've had better economy experiences on Qantas, Air NZ, Malaysian, Singapore and even Philippines Airlines.
I'm only a Scum Gold - but I was flying in business class, and I had expected much better, given all my other flights in business have been so better than that one.
I acknowledge that they fulfilled their contract and got me to my destination (be it uncomfortable, annoyed, and LATE).
They don't have to offer me any compensation, just as I don't have to choose to do business with them.
I certainly won't be inclined to choose them over another airline any longer. This experience merely served to enlighten me that they are not aiming to provide best service/experience (unlike Singapore Air). I regret not going Virgin Atlantic and forgoing the OW points - It's a small matter. Mind you, I'd still use their lounge when in HK
FWIW - The return flight back to Sydney was actually back to their usual standards, and I did get to try out the herringbone configuration. It's quite unusual being seated at an angle...
Disclaimer - I'm not a member of Singapore's FF program (don't fly frequently enough with them to bother)