Did the SIN-BNE flight as part of a Dublin to Honiara trip last year.
Not much to add - if Qatar Airways is the benchmark, I can guarantee that SQ will be a lot more professional (and nicer) experience.
As noted above, regional config on this flight. I'm not a huge fan of the QR open dormitory cabin, for example. SQ A330-300 - in my opinion - is perfectly fine for a few hours.
PJs!?