I've never even handled a CS9. I'm not sure I've even seen one in person.
How do they compare to a 3913/3914/908?
The CS9 is about a 1/4" shorter in both height and length. Not really enough to make much of a difference, but it is 5oz lighter and that is noticeable. I still prefer the 3913 size(or 3953 in my case).