Octane renders as good as the materials you provide to it. It has nothing to do with Poser or any other application. If you apply it with a realistic texture and apply material setting which are fitting to the texture and light conditions, it will render it as realistic as it can be - exactly the same as with 3DMax or any other software.

The image Face_Off has shown could have been initiated from Poser (I do not know what the artist uses). I have no idea what point you were trying to make, but I see no proof at all that Poser would not be capable of this kind of render with Octane.

In the end it is the artist who decides what material setups are the best for the image he/she wants to produce. Since that final decision is made in Octane it does not matter what software is used to provide that 3d content to Octane.