Even if we got a 'perfect' restoration, there would still be people here who would value a GOUT upscale simply because of nostalgia. Besides, there ARE differences between the '77 version of the film and this one, which would be valuable on their own.

About v15: It looks good, I like it more than any previous version! The problem has always been the ringing artifacts, and these seem to be impervious to any attempt to bring under control. But perhaps if there was an automated tool, such as Photoshop's Magnetic Lasso tool, which could identify edges of a sufficient contrast (such as Vader's helmet against a featureless wall) it could be made to equalize lesser variations in luminosity which run parallel to these edges, but only equalize them on the side of the edge which has the most parallel gradients (which are the ringing artifacts). In this way, details on the other side of the edge remain unaffected, which is where most of the superresolution detail is gained.