Actually, I very much disagree. I think if you told me I could only ever go to one lounge again at HND I'd pick JL F, but the CX lounge has some definite advantages - the food is more substantial, it has better coffee, the decor is better, it has a manned bar with cocktails, it has more comfortable seating. JL F wins on being quieter, better champagne, slightly better service, shoe shine, self serve alcohol. If I'm there for a while I normally go for food and a cocktail in CX before moving to JL F to relax with a glass of champagne until the flight is called.

For the record, I've probably been through HND International Terminal 10-15 times in the last year so this is judging from many visits.