Indeed. It's C# that makes me like Kotlin so much. I was trained in Java but used C# in a fully-professional setting for longer. C# as a language make a lot of very smart decisions that Kotlin took into itself when being created and out if it comes a non-Microsoft-owned (which matters for some people), comfortable, powerful language.
If I had to switch and use C# as my main work language for a company, I would be perfectly happy to.
I'd personally prefer modern C# as it's been outpacing advancements in other major languages for DX, IMO.
It is sad that its adoption seems to have boundaries defined either by large ecosystems dependent on the JVM or ideological.