For this eco-system to be more complete, we need the art department to make the 3D sets for us.
I've been fortunate to work with many production designers who have provided me very nice Sketch Up models of the sets, when I was a working DP. I was able to bring them into Maya at the time to use.
The SketchUp to C4D workflow with Visualize/Studio is OK, but we lose a lot of time converting the materials. I'd love to get more Production Designers in the Cinema 4D eco system, but I understand they would rather use Sketch Up that is free and their Warehouse is pretty decent.
I will continue to build out a pretty massive 3d set library myself and with some help, but if you have any art department friends, we need them to join this eco system too.