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In some ways it's nicely ahead of C#, but it's still missing some extremely desirable language features, namely async/await/yield.

kotlin 1.1 will have coroutines which cover generators/yield async/await stack-less continuations

Kotlin is missing monadic comprehension I'd say it's less powerful than C#.

Much nicer? You mean "at parity"

The syntax is a lot lighter and more modern than C#