What upscale method are you using? The best one I've found so far (at least in avisynth) is:
nnedi2_rpow2(rfactor=2, cshift="spline64resize", fwidth=1280, fheight=544)
After cropping of course.
Some people say nnedi3 is better at upscaling but somehow I found nnedi2 being smoother.
By the way, the youtube link says the file is deleted, and the other one is extremely slow to download. May I suggest using sendspace instead?