I started playing it last night for about 30 mins. I got mine free with one of my graphic cards and had it pre-loaded via GOG. For sure, it's up there as one of the best looking graphically games, especially in 4k which ran great on my system with settings set to max (hairworks was enabled to). I think the fighting mechanics are nice, especially when it zooms out slightly so you have a wider view and can see what's happening. Not sure if this was in the previous Witcher series, never played them.
Not much more to say about it with only 30 minutes played, but for sure, one of the best looking games I've seen, Dying light being on par with it for graphical beauty.
Edit: Telling a lie, not quite 4k I'm playing at. 3440 x 1440