The hardware looks pretty sexy
https://www.youtube.com/watch?v=RkC0l4iekYo
Some games look pretty neat
https://www.youtube.com/watch?v=OxzWlIbnp3U
But some are like the previous ones (at least to me)
https://www.youtube.com/watch?v=oz-O74SmTSQ
More videos:
https://www.youtube.com/user/PlayStation/videos
So it doesn't seems like the graphics are better then on todays PCs.. however I guess the point was to make everything smooth for 4K resolution. Btw I'm a PC gamer myself, haven't had a single console before (except Wii), however was looking forward to the reveal, because if consoles get better, then the games released for PC will be better looking as well..