Java and Rust are both bleeding edge in their respective domains, which are quite disjoint. I like them both, and Rust may well dominate its domain one day as much as Java dominate its own (although Rust's domain is even slower-moving than Java's, so that process may well take decades). I don't know of .NET Core winning any quality industry benchmarks that people actually pay attention to, let alone a lot of them.

TechEmpower BenchmarkGame

And SIMD is coming soon in .NET Core 3 which should be a big jump for many workloads.