For those of you who have played both....
Does the 35" on the 519 make much a of a difference one the tightness/response of the 'B' string when compared to a Sonus Special?
I have not played both, but when I was discussing my custom headless Sonus, Joe Zon recommended 34" scale instead of 35", saying he stood by the tone of 34" on his neck. I've owned and played various 35" basses including Modulus and MTD USA. I am comfortable on them, but never felt they were superior to 34" -- just different -- and that includes the B string. I had already drifted away from 35" basses, so I was happy to accept Joe's recommendation for 34".

Those younger than a certain age won't get it. 