The samples on the article show very good results at preserving details so that curves do not get blurry when scaled up but are not particularly impressive.
Off topic: I remember a few years ago, some students got very impressed by GIMP's Lanczos-3 upscaling that was much better than the photoshop version they had access at the time.
Off topic: I remember a few years ago, some students got very impressed by GIMP's Lanczos-3 upscaling that was much better than the photoshop version they had access at the time.