The necks on my Seis are the best necks of any basses I've played, with the Antoniotsais being a close runner up.
Looking at 5-strings, I haven't played a Jazz (Fender) or Rickenbacker, only played a Stingray briefly (I liked that), no Alembic, played a Fodera but that was just a 4-string (and I didn't like the neck), no Ritter.
Edit: no Gibsons either.