I second. Used to utilise fcitx4 but once tried fcitx5, I found it just has better integration with KDE, without losing old functionality. And it performs well both under X11 and wayland. (I’ve just switched to wayland since last week).
Have both fcitx4 and fcitx5 at the same time is confusing enough for users, like I was suspecting fcitx5 is some sort of dev version and preferred to stick with 4 instead. Since fcitx4 ceased development it’s better to migrate to 5 and avoid
any further confusion.