Casio CZ/ VZ/ FZ - Pro Series

Here is the million dollar question noone has been able to answer for me. 

I've heard rumors that the CZ-1 doesn't have the same "punch", "bass", "low 
end" and other stuff that the CZ-101,1000,3000,5000 have?

Is there any truth to this.  From what I can tell, the CZ-1 sound exactly like it's 
older brothers on the CZ line.

Please respond CZ users.  Let's put this argument to rest once and for all

micah