Well I can't answer your question exactly, but I can tell you what the difference was for me when I went from a $2000 pre/pro to $6500 pre/pro. The more expensive pre/pro had fewer bells and whistles, fewer settings and options, a very basic user's manual....and MUCH better sound: clearer, more dynamic, more resolved, more involving. You name it the sound was better with every source, analog or digital, movies or music, whatever.
I don't miss tweaking all the settings that I was always playing with. And I appreciate the added enjoyment that comes with higher quality sound and less fiddling.
Hope this helps.