Hi Hartmut,
Thanks for the congrats! Yeah, I love the headless concept - it makes the bass much more compact and portable, and quick string changes are a breeze, and I really don't understand why it isn't the norm for bass guitars now, rather than still being the exception. To answer your question about balance though, there is simply no comparison. The KingBass balances beautifully. The SC doesn't. And while the body of the KingBass is ever so slightly bigger than the SC, the whole thing is probably slightly lighter than the SC, given that it has no head and the neck is made of carbon fibre composite rather than wood.
However, in terms of sound and playability, the SC is in another league. While both the SC and the KingBass have distinctively 'hi-fi' sounds, the SC just has a warmth and musicality to it that the KingBass lacks somehow. It's difficult to explain, but when you're playing the Kingbass it could be any modern bass. It looks good, it feels good, it's reliable and it will always get the job done, but it's just a tool of the trade at the end of the day. But when you're playing the SC, it feels like something special. Very difficult to explain, but when you play one, you'll know what I mean :-)
K.