Until you try it you really won't know how much has been improved.  During testing I must have done several hundred images.  The speed increase made it that much nicer to play with.  I did a test animation and was getting about 3 frames a minute with image quality that would have passed the movie making course at the college.  Using Poser 12 to get the same quality it was running about 7 minutes a frame.  

Poser 5, 6, 7, 8, Poser Pro 9 (2012), 10 (2014), 11, 12, 13