TZORG, I really like your image. The inorganics are indeed very nice though it's hard to judge the Poser end of it with the more toon-ish figures for me.  I looked through several of the Maxwell galleries but I only saw one 'realistic' human that might be Poserlike:

http://www.maxwellrender.com/gallery/index.php?album=sci-fi-fantasy&image=005.jpg&p=*full-image

The detail on the mesh head cloth is impressive but the skin, well I assume that was a deliberate artistic effect. The Maxwell/Poser render here:

https://market.renderosity.com/mod/forumpro/media/folder_9/file_423062.jpg

is nice but nothing spectacular as far as the human figure goes IMO, though it's hard to tell from a distance. So for my personal view, I still do not see a Quality/Time delta compared to Vue, POVRay or several other products that would make Maxwell or any of the MLT I've seen engines worthwhile for me. If I were doing high end archviz for a living and could afford to throw lots of CPUs at it I might see things differently. Ease of lighting setup would be a factor but I use HDR more and more, so not so much.

As to a Poser-Lux connection, maybe the python binding Wolf found might be get someone interested. As for begging SM, I think they have enough on their plates with FireFly. From a practical standpoint, people are just getting happy with the faster render times of P8, I just don't see a lot of demand for a much slower solution unless it provides knock your d*ck in the dirt, insanely better renders of Poser content. Of course, I may well be wrong. 

 The more the merrier but with support for rendering Poser content in Daz Studio, POVRay, Kerkythea, Carrara, Vue, C4D, Max, and (via DS plugin), 3Delight, PRMan and Pixie, plus others I've probably missed, it's not like there isn't something out there for just about every taste and budget. Even if you do get a converter, you're likely not going to get shaders and I'm guessing probably no dynamic hair. At that point, you're down to pretty much what you could get with .obj or .3ds import which most renderers I've seen seem to have, but apparently not Lux.

Kaibach have you added Sunflow to your collection:

http://sunflow.sourceforge.net/

"Democracy is a pathetic belief in the collective wisdom of individual ignorance." - H. L. Mencken