I've found Firefly to be a pretty capable renderer once you get your head around those settings. This is straight out of Poser, my standard render settings for quality and speed. Rendered in P7SR3 in about 5 mins.

Very simple materials - no bump or displacement. Just regular diffuse and specular for this test (which was mostly about lighting). The lights were fairly straitforward as well, 1 point & 1 spot  (I used falloff on these), & 1 IBL with probelight image (light based AO).

 

PoserPro2014(Sr4), Win7 x64, display units set to inches.

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