> I have to say, I've yet to see any unbaised renders where I instantly look 
> and go "wow! POV-Ray could never do that..."

I don't see much nowadays where I say "wow, a modern GPU could never do that 
in realtime" ;-)

It's just a matter of realism and effort.  At the top you have these 
unbiased renderers that take almost no setting up (apart from the scene 
itself) and give a scientifically perfect result after a few days.  At the 
bottom you have GPU rendering, that takes a lot of effort to code, gives a 
pretty good result and takes a few ms to render.  POV is in between 
somewhere, taking a medium amount of effort to get looking good, and taking 
a few hours (not days or ms) to render.

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