Wow! Sadowsky was in the running when I bought my bass but just a little too pricey. That was surprising to hear!
I'm gonna hang onto the Sadowsky, but here's why the Sandberg became my go-to:
The Sandberg doesn't quite have that jewel-like finish of the Sadowsky, but it's excellent, nonetheless. Neck pocket is tight, fingerboard edges are comfy, fretwork is great. I really like the Will Lee neck profile, and the Sandberg feels the same. No compromise on playability.
I prefer the ergos of the Sandberg. The Sadowsky's body is chambered, and its natural balance on the strap is about horizontal. The Sandberg naturally tends to point up a bit, and that's more comfortable for me. With that compact bridge on the Sandberg mounted right at the end of the body, the reach to the first fret is a bit shorter; I like that.
The Sadowsky electronics really do sound good, but in practice (meaning quick on-stage tone tweaks) I like having cut/boost rather than boost only.
Hey, I don't mean in any way to denigrate my Sadowskys (a Japan Metro Will Lee 5, and an NYC Will Lee 5). They are top-shelf basses. But the Sandberg is the one I reach for. We're getting down to real fine points about the design, and it suits my personal preferences just a bit better.