The FAs bend over backwards to accommodate requests. I personally was really underwhelmed with the catering in F, especially the light meal options, though I know I'm in the minority. My husband actually disliked the catering so much he prefers us to fly Korean air via ICN and we're both lovers of all Asian cuisines. I think it also depends on the passenger load. Our NRT-JFK flight was 7/8 so I don't there was much leftover!