Both ex-HND and ex-KIX have guaranteed F service. Note for KIX, there are more frequencies and some don't have F. But if you're booked on one of the F flights, CX will not pull the infamous equipment swap on you. Those routes have "protected" F class.

As for the food, I have only flown back (on both routes) in either the afternoon or evening in F. So my experiences ex-Japan are dinner. And likewise, I have only traveled TO those destinations in F in the morning. So my experiences ex-HKG are breakfast.

Breakfast is somewhat disappointing IME. It is similar to what you receive to TPE in F: in essence, the longhaul J class style meal (smoothie, juices, fruit, cereal, yogurt, main). However, it is presented on F class plates and glasses etc. with all the F accessories. My first time to HND in F I got hungry for some savory, non breakfast snacks....and they simply didn't have any. The flights land Japan midday so I assumed theyd have something non breakfast. Lesson learned, I take chips or nuts from the lounge now.

Returning for dinner, the catering is lovely and certainly well done for a 3.5-5 hour flight. The kaiseki is absolutely a "wow factor" meal with beautiful plating and attention to detail for an airplane meal. I cannot say the taste is stunning....it is on a plane, after all....and now that I've done kaiseki before I don't order it. But it was really cool a few times and I highly recommend trying it.

The western and Chinese options usually have some great food - I had a lovely seafood with crab plate ex-KIX earlier this year, and I remember eating some decent lobster a few years ago ex-HND.

Just FYI the kaiseki is limited loading and the order of preference seems to be revenue (award or cash) MPC members, then revenue (non MPC), then op-ups. As an op-up I have NOT received the kaiseki before, but I've gotten it when I was paid

Oh last note: I believe the afternoon ex-HND kaiseki meal is loaded in HKG on the outbound. Whereas the ex-KIX early evening is loaded in KIX. Supposedly this makes a difference, although being honest it's still pre-prepared Japanese food in the air! While neither destinations kaiseki will be winning Michelin stars any time soon, it is still wonderfully done and I think hands down the coolest, most extensive F catering option across all of CX's destinations.