I agree... better games will  be showed in both consoles in the future.

Yup. I mean look at the new power they keep pushing out of the PS3 and X360. And both of the new machines have so much more power. In a few years all of these launch games will look last gen in comparison.

I just watched the videos. The ones you have to download and the PS4 is superior in my opinion. The colour of the xbone is not very pleasing to the eye and it has too many jaggies causing a shimmer across a lot of edges. The whole image quality is just lower.
I did notice that some textures on the xbone looked superior to the PS4's but in motion it is not enought to counter everything else that is going on on screen.

I wonder why the PS4 has a slight blur.

I wonder the same thing.

This past week I have seen this recurrent complaint or a variation on the same theme everywhere on Internet. And I am worried. A lot.

Its nothing to worry about. In motion you wont hardly notice a thing. I only really noticed in the cutscenes.