For my tupporth, SQ / MAS have a distinct edge on Cathay Pathetic cattle class because of the extra legroom. I certainly notice the difference, since my legs are specially calibrated to measure 32" versus 34". I would therefore use SQ / MAS any time they offer a convenient alternative. I hope CX take note that theirs is a false economy (ho ho) because I'd rather be in a full plane with adequate legroom than a 60% full plane with poor legroom.