I don't know if the comparison is fair because the RF1 track version is way less detailed than RF2 version (looks like a carpet, no bumps).
I think it isn't a fair comparison because rFactor 2 can look much better than in this video. The car doesn't cast any shadows, and I do believe it runs smoother on my old rig than in this video. The rFactor 1 section even has a much higher framerate in this video.
I have to say this is a pretty irrelevant comparison. So many variables; mod quality, RF2 not being finished, etc etc etc
That kind of comparison don't have any sense for me too, but I have to say that colours from rf1 looks more real and natural . Also, the real track seems don't have so much visible rubber on track. I think it's exaggerated on rf2