JAL depends on what you get, but all in all, its actually hard to say any of these seats are "small". They're all general all larger than economy by a reasonable margin and are pretty comparable to other seats. One of the things to keep in mind is that theres usually other space near the seat so its not just the seat and a wall right at the edge of the seat.
The apex suite is likely the one you're referring to and honestly it looks more weird than it feels in person. In fact in person it's probably one of the more private setups out there although yiu do have slightly less storage space than say on QF J.
