I do this trip regularly in J and out of CX, QR and MH, I keep going back to CX because their hard product beats the rest hands down whilst service is good and consistent. QR equally so although that view is only based on 4 flights - I'd say hard product not as good as CX and soft product on a par or better. I didn't like the MH experience at all - felt like being on a bus, was a bit bland if that makes sense and the small wine glasses are a real downer! However for me the deal breaker on the first overnight leg from London is the length of the first flight which is longer with CX and therefore allows a full night if sleep. I found QR a killer and arrived in SIN exhausted and had to go straight to bed. With CX I'm always in a fit state to head out for dinner with friends!