one thing i notice, looks like raytraced lighting? maybe i'm just spoiled by carrara
but the room looks like its lit by indirect light, rather than direct, and poser is limited
to direct light only, which brings some differences right off

also poser 5 while not having IBL like P6, you can still fake it with 2 lights and a bit
of skill in the mat room, adding a nice flat global light to the scene, not as controlable
though as P6 IBL, but when no IBL, its better than nothin :)

and I've seen renders done in max, maya, P5/6, carrara, and more
if the artist is good, the end result can be literally anything, might require more worrk
but in the end, no render engine really created a better pic, just mats/lighting/etc