I can't image you'll do much better than smoothing out the baked-in aliasing with QTCMC.
The noise in the film sections is hard to deal with. It looks like the noise removal used previously stabilised what it didn't remove, so it doesn't behave like noise. I think QTGMC would clean it up okay, but it might soften the picture too much. It might be better to just leave it.
Samples 2.zip (7.4 MB)