It is quite possible that PS4 games will look better than what the highest-end PC can pull off.
There is a TON of CPU/GPU power that is being wasted through the pipelines of an all-purpose system such as Windows.
Consoles always have a much shorter pipeline and far fewer background processes, and it's on controlled hardware which can be severely optimized for without fearing for compatibility.
That's how they managed to port Quake 2 to the freaking PS1. This is how PS2 pulled off games like Shadow of the Colossus and Black (with shader effects the console isn't capable off). This is how they got a near-full-featured GTA title on the Nintendo DS. This is how end-of-life PS3 titles like "Last Of Us" look pretty stunning considering the console is based on GeForce3-strength hardware.
PS4 hardware is incomparably more powerful, so I don't exclude the possibility that it's going to beat PC in terms of visuals.