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Hi your links above take us to a poser/Daz figure rendered in LUX
and a set of Architectural interior models for Maxon Cinema4D
( I happen to own that particular set from Dosch BTW),

I understand budget limitations but frankly you dont seem interested in actually learning another render app, even a free on like LUX, that supports your CURRENT library of poser content

so I cant see how this qualifies as a shortcoming of poser per say.

Sorry but it seems  to me like you have general "other"App envy .

I was about to suggest taht the Architectural interior wasn't all that realistic, and could have certainly been rendered in Poser.  Looks like omni lights were placed by the ceiling to simulate light, there's no IES patterns on the walls, and everything is perfectly reflective.  Looks like standard raytracing to me (not path tracing).

The characters on the Poser 2012 box, at least on the covers, were probably rendered in Poser too.  There's nothing there that couldn't be done in Firefly.  Probably some postwork in an image editor.  The artist is Syyd Raven.  Syyd does render with Poser, from the past work I've seen, and does great work.  She's the owner of RuntimeDNA.

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Tools :  3dsmax 2015, Daz Studio 4.6, PoserPro 2012, Blender v2.74

System: Pentium QuadCore i7, under Win 8, GeForce GTX 780 / 2GB GPU.