Hi everyone. I am flying KIX-HKG-KTM on CX. Seems like about 8-8.5 hours total flying. I have the opportunity to upgrade this from Y to J for 16k Avios + $52. KIX-HKG is lie flat, HKG-KTM is the Dragonair A330 regional seat. Is this worth upgrading?

I have Amex Platinum so I get Centurion Lounge, is The Pier Business worth any premium?

My apologies if this is the wrong forum.