Hmmmm some good things to get to grips with. Thank you Rhia474!

Read mention of the HDRI environment support aswell but am a wee bit confused because I could do HDRI Environments in Poser 12 to and have been using Snarly's EZDome, so I can only suspect something else is meant.

Rendering speed.... Hmmm it's funny but coming from Firefly, Poser 12 and Superfly was already an eye opener with respect to speed. I expect the difference will come into play as I render larger scenes. Suspected that the differences in this case are "under the hood" as they say and not obvious at first glance. 

Far too early for even the vaguest hint of the suggestion that I might regret the upgrade. I am thinking that the various improvements become more obvious, the more I use Poser 13. Already noticed there is now a Volume BDSF and since all fantastic effects are pretty important to me, getting to grips with this will be important. I need fog and dust, smoke and if I can poison a few of my figures with toxic fumes, the better! :D