Intel don't have the edge. Nvidia do. Ryzen has been shown to dominate Atoms and Skylake at super low draw (sub 20W) and there is no low draw Kaby.
Pascal is so many miles ahead I think it will take more time to catch it from AMD. The reason it is less efficient may also be the reason it is so good at coin mining however, so it may be against AMD's interests.
It's just a matter of time before Ryzen starts coming out in mobile form though.