OpenJDK and .NET compilers run circles around Go one. It's not even close. The second you go beyond "straight-line" code where function body has limited amount of locals and does not make much calls, the difference becomes absolutely massive. Go also does not do any sort of "advanced" devirtualization that is bread and butter of both to cope with codebase complexity and inevitable introduction of abstractions. Hell, .NET has surpassed Go in compilation of native binaries too. Here's a recent example: https://news.ycombinator.com/item?id=41234851

In terms of GC, Go has specialized design that makes tradeoffs to allow consistent latency and low memory usage. However, this comes with very low sustained allocation and garbage collection throughput, and Go the language itself does not make it necessarily obvious where allocations happen, so, as sibling discussions here and under Go iterators submission indicate, this results in the amount of effort to try to get rid of all allocations in a hot path that is unthinkable in C#, which makes it much more straightforward, and is also able to cope with high allocation throughput with ease, much like Java.

It is indeed true that Java makes different design choices when tuning its GC implementations, but you might see much closer to Go-like memory usage from .NET's back-end services now that DATAS is enabled by default, without the tradeoffs Go comes with.