Bizzare.
I've owned Catalyst since launch, and yes it's very soft, but it's the unmistakable softness of TAA; I never once suspected it was due to it running at a lower resolution. No Man's Sky, for whatever reason, looks plain low-res at times. Like I said in a previous post, I had suspected it may be a cheap dynamic DoF that was the culprit, but if you're saying you've been able to disable every effect, and it hasn't done anything to help, then it must indeed be down to the renderer itself. I wonder if the game's use of voxels has anything to do with it?
Anyway, I've accepted it at this point, and have actually begun to play the game. I honestly wasn't expecting much, and I was right not to, it's pretty simple. That said, what it does, it does well so far; a surprising mix of relaxation and obsessive compulsion ;p
