At my company there have been several devs trying to introduce Clojure as well as parallel forays to introduce Kotlin. Overall, Kotlin has caught on and spread much more rapidly and with less effort.
This is not a statement of which languages are "better" given all things equal or what problems each are suitable for, but in my first hand experience it is easier for the average Java developer to pick up Kotlin. Of course we as a company are also cognizant of the IntelliJ lock-in as I suspect using any other editor would run into the same random bugs / autocomplete annoyances that the GP experienced.