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I think, one of the main features that makes Kotlin a bit better than other JVM languages is full compatibility with Java. And by full I mean 100% with no exceptions.

And Kotlin became good choice for android developers a long ago before io2017) Official support means a better tooling, nothing more

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Can you give an example where Groovy would be less compatible?

I think it would be hard to call dynamic groovy types from java

Because Kotlin is the language being financially supported by a business, perhaps it's better to ask for an example where Groovy is more compatible than Kotlin. The only example I can think of is scripting in Grails. Even Grails 3, which was released over 2 years ago at the same time VMware ended its paid support for Groovy, only uses Groovy for its scripting.

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