I didnt examine those pics in full screen. but i did look at them on another website bigger than they are. and it does seem like there are more particle effects there, thus more pixels per shot.
the PS3 pics look absolutely stunning, but thats based on years of technical refinement and such broad colour paletes. they look better from an artistic perspective since the UE4 engine is using mostly dark colours. so theres also the case of lighting here?
but if thats how good UE4 looks, imagine what it will look like with the years of refinement those PS3 game engines have had. at the same time i still think UE3 looks stunning.