Alright so my specs are:
GTX 580 1.5gb
Core i5 2500k @ 4.5ghz(ROCK SOLID STABLE for 3 years running)
4gb DDR3 1600(Gskill Ripjaws X)
Running at maximum settings just to see how it plays, so far I've had a couple hitches in the first cutscene(when Skullface leaves Chico and his goons are heading through Camp Omega but then it's fine once you get to halfway through their little trip) and one long hitch/freeze before loading into the game. Feels pretty good to be honest, and looks a whole huge leap above the PS4 version
I'm averaging 45 FPS but sometimes it goes up to 55-60, the very odd dip below but it's almost always above 40. I should mention I am playing the game without the recommended driver so I am probably going to update my drivers and see where that takes me, so far no complaints really as I believe I am(stupidly) maxing out my VRAM/RAM at 1080P with everything on the highest details. Which would probably explain the initial hitching but it seems more than fine, it's not like BF4 where it turns into an impossible slideshow.
So far I have no trouble with playing the game it feels pretty smooth, Mouse and keyboard feels perfect and I love that they have a movement modifier key(not quite like Chaos Theory with the mouse button for character Locomotion speed but good enough, works like Thief 2 with the creep button).
Holy fucking shit at the graphics though, this definitely looks like the original GDC/Debut demo they played way back when maybe even a bit better. The Bokeh DOF is amazing, absolutely love it and the game sounds so much better on PC for some reason then again that could be my headphones lol.
I'd say the biggest improvements would be model detail, pop in, and lighting, the lighting is dramatically better.
I might tinker with the settings to achieve the best compromise, but so far I'm happy.
The one thing that is a huge oversight is it seems that I can't navigate the equipment menus/Hold up menus by just flicking the direction using my mouse! This results in me having to use my nose to hit down on my arrow keys to make it work.
I might play with the keybindings a little bit to see if I can remedy the issue.