dunno, but from my latest (and one and only) trip on JL C on award I wonder if the lack of english ability was one of the reason for gaijin to sometimes feel negleted. i was on NRT-AMS 2 days ago and found myself almost repeatedly served by 1 specific FA. While stretching my legs i found out i wasa the only seemingly non jap speaker on my side of the cabin. so i guess taht's partly why sometimes gaijin do get neglected if the crews arent too comfortable with english.
as a comparasion when i rang the bell while that FA wasnt there, it was a bit of a mess, despite it was sth very minor. :S...