Moth3r said:

Best upscaling/antialiasing results I've seen so far is whatever dark_jedi used on his Blu V2 sample. I compared the sample against the output from a nnedi3 upscale, and it was much better.

GOUT NNEDI3

DJ Blu V2 Sample

I think his results are repetable, if not beatable in AVISynth. I only did a quick test where there was very little done to the image prior to upscaling. DJ's version has had substantial grain reduction and anti-alising applied before upscale and getting that right is definatly the key to improving the upscale result; however as I mentioned you still need to handle different types of scenes differently, espcially space scenes and scenes where the DVNR was very heavy.

Here is that scene with some grain removal and aa applied to the raw PAL gout (notice how the framing is slightly different, I would expect better success for NTSC especially in regards to anti-alising). NNEDI3 is then applied.