Xbox one is not at the same performance level as ps4, its not some conspiracy its just reality.
There has always been multiformat games that were designed around weaker hardware and are not optimised for stronger hardware. You only have to look at PC forums to see how many console games aren't enhanced for PC and see PC gamers complaining about it. I remember a huge number of PS2 games that were never enhanced for the original xbox despite having close to twice the memory, 3x the processing power, superior gpu and a built in hard drive yet many games looked the same. Multiformat games are often written with the lowest performing hardware in mind. Sometimes enhanced on stronger hardware but occasionally not.
The PS4 is already at a 70% market share advantage to xbox one. As the ps4 starts to dominate this generation it will be more critical for developers to maximise the ps4 performance level. So I think realistically for commercial reasons and technical reasons the ps4 performance level advantage over xbox one will widen.
