I've had a quick play of it now, in places it looks quite nice but there's something just not quite right about it. I'm not sure if the HDR is working properly as the gradation of colours in places looks terrible, banding and pixelated.
The gameplay is smooth however there is popup at time, also and quite annoying is the textures, there is a short distance in front of you where the textures just drop in resolution and quality and just fill in. At one point I thought I was walking towards a barrier but it turned out to be just a straight line of fog.
Here's a quick screen shoot (reduced in size)... original being played on a 4K TV with HDR etc:
If you look at the area not far in front of you there is hardly any detail:
I need to play it a bit more but not too impressed so far.