I only took this flight yesterday. It's hell on earth
Do not expect a meal on this flight- it is simply a snack box, as mentioned by previous posts, consisting of - a stale ham & cheese roll, a mini fruit box, a macadamia short bread and a muffin. Plus a carton of the sweetest hk style lemon tea - which is disgusting.
Unless you're a seriously deep sleeper, don't expect to catch much sleep - this flight is FULL OF TOUR GROUPS and last night, those holiday makers just would not shut up. I could still hear them wearing my Bose QC35.
And finally if I were you, I wouldn't select seats as far as row 78. This flight uses a very dense config regional 777-300. You'll be the 400th person to deplane. And
0600-0700 is peak arrivals hour at Narita, you will be waiting for immigration for a very long time.
For me - never CX524 again... in fact, never CX between HK and Tokyo again. JL operates with much more comfortable planes and their seats & catering are actually nice.