I will create comparison pictures when I am finished with all the textures. I don't want to lose the overview at the end where I have to change pictures because there is still a not upscale texture in it. I have already uploaded some test images for the HD Age elevated-rails mod, but they do not reflect the current state.
I saw those, although I clicked back and forth and could not tell which one was which. Zero difference. I am on 1080p, and maybe the website is compressing them - but I would have suspected at least some visible difference...
The images are very large and are displayed at a reduced size on the website. To see the difference, right-click on the images, save them and view them at 100% zoom.