Very nice results! Is it a room created in Sweet Home 3D, then imported into Blender and Yafaray?

My main problem about trying other solutions is time!
I spent with others contributors a huge amount of time tweaking SunFlow parameters and fixing bugs in this library to get the current rendering. As SunFlow isn't really maintained anymore, I even wondered if I shouldn't have better translate from Yafaray into Java.

You should also notice that many users are satisfied by the current result and expect more new features like multiple levels and roof management, than a better rendering.

A first approach could be to develop a plug-in able to translate Sweet Home 3D / Java 3D data in a format supported by Yafaray (you can have a look to OBJWriter and PhotoRenderer classes to get ideas), then launch Yafaray renderer with the exec method of the Runtime class. Who wants to try?