The difference being CSharp is actually used by a large number of people. Scala is not even in the top 10 used languages [0].
Your comment was about C# being "the best language in terms of features and improvements", nothing about usage numbers.
I agree that C# is far more widely used than Scala, but Scala is being used by significant numbers of developers esp. for Spark. Tiobe is also widely regarded as a pretty poor indicator of language adoption.
Re:What’s New in C# 7.0
by premium-concern on Thursday August 25, 2016 @04:51PM
(#12362411)
Scala is consistently #15 or #16 in various measurements. Just not in TIOBE as they decided to use the wrong search terms to look for, so TIOBE doesn't provide useful information in this case.
That's a pretty sweeping generalization. Most of the headline features in the article are already in other languages e.g. Scala.