Hi-res texture blurred on mesh

Why is this happening? It’s just texture on the default plane and texture opened in Image editor:

I’ve tried to change interpolation modes in texture node, but it maked no difference

Is there a relative-scale problem in the UV mapping? Not quite sure why the shapes look lighter, but could the graininess be caused by interpolation? If you change the size of the UV-map polygon relative to the source image, what happens?

Share this part of the scene, including the texture file in this case.

I’m a little confused, what do you mean?

I’ll send it tomorrow morning

Blur doesn’t look uniform. Looks like DoF to me. Sure you don’t have DoF on?

Ok, I’ve been a bit busy and the problem has gone somehow. I guess it’s one of 2.8 bugs