Thanks for the sample!
Here you are the comparisons:
SuperResolution V3 Vs MagicUpPlus + GrainPlate2
http://screenshotcomparison.com/comparison/121901
Spline64Resize + GrainPlate2 Vs MagicUpPlus + GrainPlate2
http://screenshotcomparison.com/comparison/121902
Spline64Resize + GrainPlate2 Vs SuperResolution V3
http://screenshotcomparison.com/comparison/121903
MagicUpPlus + GrainPlate2 clip
https://www.sendspace.com/file/u5xjzb
my thoughts: despite the fact SuperResolution V3 is (obviously) cleaner than "classic" upscale filters, it relies on artifacts... indeed, you could see that it distorts some shapes (eyes, last teeth etc); MagicUpPlus increments details while maintaining shapes... I added a grain plate to give the impression of further details.
Said that, I must thank you, because this thread inspired me to find new ways to further refine my own filter, as you can see here:
http://screenshotcomparison.com/comparison/121908