Depending on whether you'll get new F seat or not.

Dragonair's (KA) new F seat = CX's new business class seat
KA's old F seat = CX's old business class seat

Check in should be smooth and usually don't need to wait.

There is no F class lounge.

In-flight service is excellent, although if you're on old seat, there will be not video entertainment at all.

You can park your miles into Asia Miles, you'll get 1.5x for flying F.