X1 is doing 1080p60 though. See Forza. The 50% thing is nonsense.
The 50% relates to the graphics card difference, not overall system
XBOX ONE GPU:1.18 TF GPU (12 CUs) for games768 Shaders48 Texture units16 ROPS2 ACE/ 16 queuesPLAYSTATION 4 GPU:1.84TF GPU (18 CUs) for games + 56%1152 Shaders +50%72 Texture units +50%32 ROPS + 100%8 ACE/64 queues +300%
Before anyone moans, go check how graphics cards are compared for the PC in the hardware hangout.