Hi there

You still need to use one or more extra lights in Poser as in other renderers if you do interior renders,for exterior renders you should be OK with using EZDome etc,but still I prefer to have extra lights

IBL yes they're used mostly in Firefly,but not in same extent than in previous versions,Poser now using SuperFly which is same or similar to Blender Cycles,I've done all my renders in Poser,I use other SW like 3DS Max or C4D for few projects

Hope this helps

Thanks,Jura