I was on the reverse flight on Thursday. Seat map didn’t show F seats in J, but Expert Flyer showed a 4 class 77W operating. A quick call to CX and was assigned a F seat about 5 days before departure. I am a one world emerald but don’t know if that made a difference.

Interesting to point out that while the menu and amenities were J, service was F. Curtains closed during the flight, individual notes handed out to passengers and J cabin held back on arrival.

All in all a great flight!