Quote - I'm never going to render in Poser again. Ever.

Enh.  While I'm looking forward to seeing your material conversion (and as I mentioned, finally getting GPU rendering), for myself I see two things stopping me from making that declaration.

First up, I don't necessarily want realism all the time.

Secondly, hyperrealism + Poser characters (and most CGI characters available, actually) = nosedive and impact into the Uncanny Valley.  In the image you have with the model on the car the long-observed problem with Poser shoulders becomes glaringly obvious, wheras in a more non-realistic render that sort of thing is easier to overlook, just as non-realistic characters are even more accepted in traditional drawings and animation.

It's one of the reasons Pixar doesn't do realistic humans even as their technology has improved: it's not that they couldn't, it's just that it doesn't suit the purposes of the types of stories they tell.

I put this proviso out just to make it clear that Luxrender and LuxPose will not be the end-all and be-all for everyone, even one who want to do semi-realistic rendering.