Here in the UK, Freud is main supplier of router bits, they have a way of incorporating 'micro grains' of carbide into steel to get the best of both worlds.
I have been trying to get a carbide carving knife for the kitchen. Bought a 'fusion' knife from James Richardson of Sheffield, but not too sure that it has a carbide edge.
The other way of extending edge life is to coat with Titanium nitride.
This gives a gold colour finish. However, I find effect wears off fairly rapidly. IMO carbide is king.