Superfly is actually Cycles which is an excellent unbiased renderer that can go head to head with professional renderers costing $$$$. Keep in mind that it's still relatively "new" to the Poser community (uptake in the Poser community runs like molasses, people are still using P4 ffs) so people still have a long way to go to coax the best out of it. Firefly has been around forever so people have learned to squeeze some amazing results out of what is actually a technically inferior renderer.

This is done with Cycles: https://www.youtube.com/watch?v=Y-rmzh0PI3c

And here's an old comparison of Cycles vs some other top industry renderers: https://www.blenderguru.com/articles/render-engine-comparison-cycles-vs-giants

It fares pretty well in that test (and keep in mind it's from 2015, since then Blender has been evolving at an exponential rate), and the results are subjective. Personally I preferred the look of cycles in a couple of those.

Performance will also increase exponentially as more people upgrade to current GPUs.