So I finally have a working Blender to Renderman workstation running and have been doing a few tests. I ran an example test that is included with the MOSAIC package and rendered both Aqsis and Blender renders, and while the results are expected (I honestly expected the Blender render to be nothing like the Aqsis, not to mention taking twice as long to finish), doing some composite work in Blender to see the two side by side was also quite interesting.
Blender Internal :
And the screenshot
There are uses for both of these renderers that can be used, and in some cases required. Not only was this a test for my own purposes but at the same time proves that Blender can still be plenty useful when rendering is done and compositing begins.
A very exciting time to be working with all this software now and without too much frustrating technical issues as there was 2 to 3 years ago.