I like that last render, adp. note how it's got the ambient occlusion under the wheels that's
missing from the poser renders. however, I'm thinking that maybe c4d could do the AO
a bit more under the outside edge of the left front wheel, where it's touching the surface,
to give more of a feeling of sitting solidly on said surface.

p.s.  they can't add all those features to FFRender, as somebody already noted, because it
would slow to a crawl, taking days to render.  like back in the old days with bryce, where some
mac user would brag about how he spent the last two weeks rendering one of those wacky
640X480 grand-canyon-style things.