well, I just looked at your image and if you run some blur over your "best", it looks a lot better and it's not like there's a huge qualitative difference in actual resolution/visible detail - even when you are comparing your improvement on the posted mini-image with the ML-generated one supposedly from a non-compressed/scaled image. And in high-res you then would see the inevitable artifacts of "one-filter-fits-all-CNNs"...