To give you an idea how the HD GOUT is created, I will roughly describe the steps to create it.
First a raw super resolution upscale is created with the super resolution script I wrote:
http://screenshotcomparison.com/comparison/123952
This raw upscale has the enhanced detail, but also has enhanced grain and unwanted noise. Therefore in the next step the raw upscale is filtered with a non-linear filter I wrote to get rid of the grain and excess noise:
http://screenshotcomparison.com/comparison/123956
Some of the detail is removed in this intermediate step, but this can be recovered. By applying the same filter on the Spline64Resize upscale and adding the difference to the filtered super resolution upscale the final result is obtained:
http://screenshotcomparison.com/comparison/123957
As you can see below, the final result has the detail of the raw super resolution upscale and the grain and noise structure of the original GOUT: