Originally Posted by
zoobtoob
I would fly AC J for two main reasons.
Fully flat seats in AC J are way more comfortable on a long haul flight that any variety of traditional seat (JL Y+). Soft product may be better with JAL being an asian carrier with typical asian carrier (excellent) service but YMMV.
What he said. Any modern J offering, especially a fully-flat-bed kind, is going to be a night-and-day improvement over Y+. On those long flights, being able to sleep comfortably for several hours makes all the difference.