I've created a very short clip without spoilers, from the very beginnng of the game, just to show you what it really looks like.
This is PS4 Pro footage set by default to favour resolution, rendering at 2160p, then automatically supersampling down to my 1080 TV. Once realising that was the default setting, I have since set it to favour performance, plus extra visual effects. It looks literally no different to me other than a few lighting effects, so I'm guessing that it will look amazing on the standard PS4 too.
If you liked Tomb Raider, this will blow you [and it] away.