Although the degraining may help (or not), I think the idea that the increased detail in for example the edges of Obi-Wan's hood are simply "micro-contrast in the grain structure" to be pretty unconvincing:
http://screenshotcomparison.com/comparison/121822
In one of the comparisons for Leia's face for example you can actually see the blood veins in her eyes, and wrinkles in her face, which are actually not visible in the original resolution GOUT (but are visible in the SE blu ray):
http://screenshotcomparison.com/comparison/121736
Or the detail in the stormtrooper's eyes:
http://screenshotcomparison.com/comparison/121755
These real details are clearly visible in both the super resolution upscale, and the SE blu ray, but not in the GOUT.
So I would say if it looks like a duck, and it quacks like a duck, it's a duck... :-)