Got the NTSC DVD of EP4 as source; lot better than PAL DVD (and also a bit more image on the sides); for my latest test, I cleaned up the source, upscaled it with two different upscale filtes - one called MagicUpPlus, the other called MagicUpSR, based on SuperResolution technique - and merged both 50/50; left the grain plate out this time.
SuperResolution V3 Noise Reduction Vs BasiClean + MagicUp merge (Plus & SR):
http://screenshotcomparison.com/comparison/122268
Can't say which is the best, because one has something better than the other and vice versa, so I decided to put each against the HD version - taken from HDTV, cropped and resized - note that the images don't match, but this is beyond the scope of the comparison...
BasiClean + MagicUp merge (Plus & SR) Vs HDTV:
http://screenshotcomparison.com/comparison/122269
SuperResolution V3 Noise Reduction Vs HDTV:
http://screenshotcomparison.com/comparison/122270
Now, it's you turn... pick your poison! (^^,)