well, I own both. I have USATK5, and a Sonus 5. I love them both. But the ATK still isn't in the same league as my Zon. That being said, they are both 2 of my "never sell" basses.
R.I.P. Dimebag Darrell
METAL CLUB Member #11 \m/
Bongo Club #24
ATK Club #22
"The world is full of Kings & Queens that blind your eyes & steal your dreams. It's Heaven and Hell" - R.J. Dio 1980