NX is not going to compete graphically with Xone or PS4. Why you ask well the most obvious bottlenecks are the powersupply, heat and battery life even if you would supply a gtx1080 with only 20 watts it probably couldn't beat the PS4. And the hybrid NX considering rumours are true also is in need of a CPU which also needs power and generates heat.
Even if Nintendo develops thw most efficient architecture ever for the NX (which would probably result in development hell like the cell). It just isn't yet possible for a portable device to come close to Xone and PS4. Especially if you want to sell the hybrid console for less than $300.I suspect the NX will be close to Wii U in therms of power, perhaps a bit more powerful. Graphical cards don't perform equally on PC and a console due to drivers and a more dedicated
Please excuse my (probally) poor grammar
