Latest test est! (^^,)
MagicUpSR3 + BasiClean + GrainPlate Vs MagicUpSR3 refined + GrainPlate:
http://screenshotcomparison.com/comparison/122645
I don't think I could do better than this with actual techniques... unless someone could port/convert some new ones to avisynth, like:
http://www.wisdom.weizmann.ac.il/~vision/SingleImageSR.html
or the one previously posted by happycube