Haters will deny but it is...
Of course it is more powerful than Wii U but the gap is widen between PS4 and Xbone than Xbone and Wii U. The multiplatform games will show even a widen gap in the next years when the PS4 started to optimized. Xbone will start to be optimized too but the limit is far bigger on PS4 than Xbone.
Anybody that knows a little about GPU, memory system and virtualization will say the same to you.
BTE I didn't expect a gap like MGS too soon with PS4 having smooth framerate than Xbone... maybe the gap in power is even big than I think.