Well, I have only been using Poser for a shot (~6 Mo.) timeframe, but I can definatley see imporvement.  I don't usually do  stils, only animations.  However, you can see improvement in each project.

I've done lots of test renders, but here are the four main projects that I've completed in that timeframe.  The first three projects were a fun contest at a video editing forum I belone to.  These were kind of a "Yo Mama" type of joke (and believe me, the other guy got his digs in too).  I learned so much from doing them that I decided to enter a contest, and that is what the last video is.

www.slakrboy.com/videos/BattleTrailer.wmv              First Render I ever made
www.slakrboy.com/videos/pestcontrol.wmv                1st part of a two part video
www.slakrboy.com/videos/pc2.wmv                             2nd part of the two part video
www.slakrboy.com/videos/stranded-high.wmv          Contest entry

My Church has actually approaded me about doing an animated Sunday School lesson for Pre-Schoolers, which is the project I'm working on now.  If this Pilot episode takes off, I will be doing a 1-year project with them that we will sell to other churches.