For a single object here is no difference between raytracing and any other rendering method if you use the same lights and the same mathematical model. It must be the same and can't be different, light behaves always in the same way.
The difference is when exist more than one objects and project its image over other objects or illuminate it, or the light path is bend.
In this case raytracing can provide more correct results where exist interaction between objects.
I am not speaking about shadows that can be handled in a correct way by various means, I am talking about one object illuminating or proyecting its image on other object.
When the number of objects is increased raytracing also fails to produce correct results because the number of bounces of a ray is limited to a small number due rendering time, in this case radiosity produce the correct result, but radiosity only handles illumination and not image proyection.
I am speaking in general and not of the particular implementations of firefly, Poser7 emulating Poser4 and Poser4, where each implementation has its own deficiencies (firefly is inferior to Vue)

Stupidity also evolves!