hi oneworld fan,
i have been on about 20 flights with SQ in F over the last two years. cannot comment on J.
all flights longer than five hours had caviar service, including all asia-australia connections. call-button were answered instantly. food load was always good. food quality was worse compared to LH (exception: all catering provided by QF) but this was consistant over the two years.
really, could not see any downturn as I could on other airlines. also the lounges did not go back any little step. i really could not get the idea that SQ was saving money on me at any time.