Err... what does it matter? Even if say Xbox 1.5 sold double what the PS4K did... wich is quite unlikely. Makes no difference. The generation race is over.
Anyways... these are all rumors. We dont know what the NX is, we don't know exactly what the PS4K is and we know that Xbox 1.5 isnt a thing. Getting a tad bit ahead of yourself i'd say. ^^
Most people, myself included, assume the NX is a new console. The vast majority of "leaks" and "rumors" point to that, and logically Nintendo needs to replace it first anyway (the 3ds can last another year or two compared to the Wii U). The PS4k is most certainly a very powerful PS4, not VR or a handheld. I know the x1.5 doesn't exist currently, but Microsoft may change their minds so they aren't the weakest console in the market. I wouldn't say I'm ahead of myself. It's logical to assume that these devices will be similar in power, yet their predecessors will have market share of their own that these new devices will have to compete with.