Just because its slightly less impressive than the exclusive NA only PS4 numbers, does not take anything away from Microsoft's accomplishment, i know people love to compare the two, but historically the Xbox One number is very impressive.
The thing now is that Xbox One has no other major places to launch in, "Tier 2" European countries is not going to yield big numbers for them, Japan even less so. Basically this is the launch, there is no follow ups like Sony has with Europe soon, their stronghold and Japan which is a gigantic question mark in regards to consoles in general.