Ice-Boy has a point.  In order to make a valid comparison you have to compare three things in combination:

a) effort put into the setting up of the render,
b) time to render, and
c) quality of the render.

In order to make a true comparison, you have to consider all three.  Does it take more work for Renderer A to output something decent than Renderer B?  Did you at least try to to get a decent result  (or did you not have to do much at all to get good output)?  Similarly, does it take 6 hours to get a good image from A, but only 5 minutes to get a not-quite as good but still acceptable image from B?

To make that point further, as it stands and until they get significantly faster when GPU rendering becomes available, an unbiased renderer would get minor usage for a lot of people doing 3D comics (unless they have a decent rendering network or slow output) because the quality isn't sufficient given the time it takes to output a single image of fairly large size, given the number of images that they might have to render and taking into account changes they might decide to make.