Without being negative, I found the service on a recent flight NRT-SIN in C was markedly better than the service SFO-NRT. Somehow both more attentive and less intrusive at the same time, and overall just friendlier. But without enough experience on UAs intra-Asia flights I don't know whether to chalk it up to the particular crew on either flight or a systemic difference between the routes.

That being said, I had nothing to complain about on any leg of the flight, just more to applaud on the NRT-SIN-NRT legs.