Are there even 15 International carriers offering F class (not counting the USA’s version of domestic F - which isn’t).
There are actually well over 20 of them. FWIW, my personal ranking which takes into account inflight hard and soft products, service, amenities (like wifi) as well as ground services such as lounges and personalized services.
1. Air France
2. Garuda Indonesia
3. Emirates
4. Qatar
5. Lufthansa
6. Cathay Pacific
7. Singapore
8. Swiss
9. Etihad
10. ANA
11. JAL
12. Korean
13. Malaysia
14. Thai
15. Asiana
16. Qantas
17. American
18. British
19. Air China
20. United (recently mercifully discontinued)