I have to say, to me, it's not the lighting or render quality which gives it away as a "Poser" rendering. It's the models. No offense to whomever made those props, but in this realistic light, with these materials, they do look a little "soft", and fake. Almost like a dollhouse furniture. I'm sure at a distance, with characters in the scene, they would serve their purpose well, but for realism in a scene like this, I would be looking for more detailed props.

I also think the floor is a little too glossy for wood (if it's supposed to be wood). Even the highest polished wood floors would have some fresnel reflectivity, and appear more blurry, with some bump involved. All the other materials look ok, and the lighting is good. I think using more realistic models would really make this a great render.

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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.