To add complexity to this discussion, I can set up a Poser render that takes many hours to complete.  Right now, for example, I have an image rendering in Firefly that measures 1600 x 1600 pixels at 300 dpi, with separate IDL and SSS passes. I started it rendering at 6 this morning, and now, 7 and 1/2 hours later, it's still not finished. So, I'm not ready to give up on Reality just because it's slow.

There's a logic to the idea of using a particular render engine for a particular purpose. Maybe I'll use Lux for a scene involving a character immersed in water, or something along those lines.  I'm interested to see how the render engine handles water, which is particularly unrealistic in Firefly.