Bit of a can of worms this one.
Is it possible to take,say, a Harley Benton Jazz, and upgrade everything, from the fret finish and tuners to installing all new electronics, to the point where it plays and sounds as good as a Sadowsky.?
I have no idea, other than that buying all the premium components would cost a lot of money in itself, but anyone who has bought a much more expensive bass, and I'm one of them, would prefer to think that it isn't.