It improved with mono and it's great to see continuation with core by ms. I don't use it atm but I remember learning c# from their beta book before v1, it was better than java even at that time. I've used c# from objective-c macos app maybe 6 years ago, it was pleasure to write c#/objc interop with mono and see same codebase used on windows app working fine (even faster) on macos via mono. The state must look much nicer now whan 6y ago, if I see opportunity to write some c# code now, I won't have any personal reservations, I'll do it with pleasure.

ps. my personal favourite programming languae at the moment is by far Julia and I encourage anybody to have a peek at it - I've missed it somehow[1] [2]; followed by crystal

[1] https://youtu.be/DRKKAFYM9yo [2] https://youtu.be/HAEgGFqbVkA