But that's an apples/oranges comparison, isn't it? C# code in Unity games is predominantly high-level game behaviour / scripting. Most of the heavy lifting is done by Unity behind the scenes. So to me it's even more impressive that an emulator for a modern games console can be written in a 'managed' language.

The heavy lifting bit of unity is also written in C#. C# has a rep for being slow which is undeserved these days.