The main time I saw slow down was in the comparison near the end as the camera panned over to the, green thing. The PS4 was "behind" the other two, but the PC was smooth, the PS4 one was pretty damn smooth just a little behind while the XO managed to jerk around like a piece of ****.
SO it looks like PS4 was doing some frame smoothing or maybe they just lined up the video slightly wrong. The XO certainly seemed to have significantly more jerking and I presume a much lower frame rate considering the difference in smoothness between them. XO loses again by that count. Marginal differences in actual quality between the three titles. But without knowing what settings were used who knows how much better the PC could look. But when they look this similar the difference is going to be frame rate and as per usual the XO is taking a large hit there, to offer the same visual performance as the PS4, you get worse frame rates and jerky game play, it may only be in parts in which case I'd probably put up with that, but I suspect you'd see that happen repeatedly.
To a certain degree we are seeing hugely improved textures on consoles which bridges that gap to PC hugely. Not least because a game would come out on the 360 with frankly rubbish textures to fit in it's tiny memory, then release on PC 6 months later and they'd add a high def texture pack. Current gen both PC and consoles can use about the same amount of memory for the textures so are using same textures... not surprising they look so so much closer.
Where the PC wins is res, AA, AF, frame rate and maybe some added fancy special effects thrown in depending on the game.