Then if I got this straight, Vue has an independant renderengine aswell (new from ground up). Was it constantly evolving From Vue1-2-3-4...?

I wish I would see a test in which all engines would render the same thing on the same settings and see how they all compare there, everything else is so assumption based.

I did a test once, comparing it with C4D's inbuilt standard engine and I got both Vue and C4D render almost the exact thing (both only using point lights) and it turned out they were equally fast to the second almost, so I think if a renderengine is really significantly slower than another there must be a fatal error in the programming, or the settings are just too high by default :P