The large enterprise outfit I work for has 8% IE11 usage still, almost all of which is in Korea. Our customers there go out of their way to not use Edge on their machines.
The question is why? I want to put on my tin foil hat and speculate about Korean knowledge of Edge 0-days (maybe North Korea is known to hoard those for some reason) but then again if you have edge 0-days it's probably trivial to get IE11 ones.