All that can be said is you can write an equivalant game in a different language, with the same speed.
That being said, it all comes down to how it was coded. You can write a fast game in C# or Java if coded correctly, and a bloated slow game in C++.
There are reasons why others like the language they chose. So in the end, it's what you're most comfortable with. Unless you are going for industry, learn what you can on everything!