http://www.gamersyde.com/hqstream_the_witcher_3_wild_hunt_ps4_xb1_comparison_v_1_01_-34665_en.html

I will stay away from the discussion...

Kidding.

From my opinion the resolution is only the difference I can spot from the video in terms of graphics (the PS4 is cleaner and have a bit less aliasing).

Performance wise the Xbone version runs even worst than PS4 version.

Like you said, the PS4 version looks a bit better.

Also, is it just me or the XB1 version looks darker? Like, a lot darker. O.o I don't like it.

For some reason the X1's upscaler (and 360's I think) messes around with the contrast, which makes things darker.

They look the same to me.

I want to see a frame-rate test.

The framerate is best on ps4 based on what people are saying.

Is always best, but I want to see if there is a relevant difference. Also, I want to see how good/bad is in both versions.

Yeah, I agree, I haven't seen that much of a difference yet in frame rate.

To be fair the PS4 version doesn't run solid too :(

people on gaf say the frame rate difference is very noticeable

Yeap... you can see in the video.