Somewhere over on RFF there's a thread with a color rendering comparison of the Canon 50/1.5, Jupiter-3 50/1.5, and one other similar lens (maybe the Canon 50/1.2? I can't recall). I suspect there are other direct comparisons of these lenses and others out there as well.
I'm not sure I would have characterized the colors from either my J8 or Canon 50/1.5 as "pastel" (especially the latter), but they are a bit lower contrast compared to more modern lenses. I also use lens hoods on basically everything. I'll throw in a couple of samples just because (sorry I don't have identical images for a better comparison). First from the J8 (on Portra 160):
And from the Canon 50/1.5 (on Kodak Gold 200 - note that these are both taken wide open):