A fly SQ A330's quite a bit, angle is about the same as Skybed MKI, though on the 777's seems flatter but then again more space too so could be perception or maybe they are using the extra space to make it go flatter.
As for SIN-CGK, still a lottery. Yes it is 773 or 772, but could be regional, old long haul, new long haul, what ever they have lying around at the time. Your right for a 1.5 hour flight it isn't an issue, but does show lack of consistency, which again is something Qantas gets hammered for on this very board.
And even away from that route there is still a lottery if you get new long haul or old long haul on the 777-300's. Only one or two routes have it 'guarantee', but again like Qantas that guarantee can be broken due to operational decisions.
CX not much different either, especially during their fleet upgrades, which is what you expect. But again Qantas gets hammered, not rolling out quick enough, flight lottery. Frankly cannot see how they can do it any quicker. They are upgrading two at a time, one gets done another goes in. Yeah they could pull more aircraft out of service, but then would have to cancel flights and people would whinge.