[hinkley]

Who has it now is a good question, but so too is 'who had it first'.

And if you also consider the upgrade treadmill, and where the average Java developer is relative to say ten years ago, it may turn out that at any given point in time, the Kotlin version you'd be able to deploy may have a number of features the most recent Java version you could deploy does not have.

(to say nothing of companies where 'the version' is decided by committee or fiat and thus having a more obscure language sometimes gets you less scrutiny).