I thought of making a detailed analysis of Xbox One and Ps4 perfomance gap.
With dx12 and tiled resources devs will not have any problems hitting 1080p/60fps which is great. With dx 12 devs will get increased CPU advantage which is awesome because CPU is a weak part of systems this gen. Gpu's will also have increase but pc gpu will enjoy the biggest advantage. We all know XBox one and ps4 have equal amount of ram with ps4 having less 4.5 Gb and XBox having 5gb in future when both companies improve the console is ram will get more for devs on XBox one it can go upto 6-7gb and on ps4 it cannot see such a boost because ps4 needs to store that HD recording. 1st party devs will make use of Xbox one's sound chip which can handle sound based calculations so Cpu and gpu are free from this task and remember that sound takes good amount of power. Using cloud on XBox one will be great MS showcased a demo on pc if it is cloud based it is based on internet not on local power so if pc can do XBox can do if we go by demo it actually provided a big boost in perfomance. That was one example. With cloud ai calculations can be removed from local machine and taken to cloud which means more power to dev on local machine and much better ai. Small things like lighting or character clothes can also be done on cloud. With all this info we have a idea that XBox and ps4 power difference is not big the way people look.