Yes the G&L SB basses do feel like sleeker and more refined versions of their ancestors. My old SB1 with flats is like a pair of ancient jeans that feel like a second skin, combines with a pair of warm slippers.
When I pick up the Stingray (pre EB slab body) it feels like a right chunky sod, but I love that about it, and for me the hand position is really comfortable - the bass isn't even very heavy, so that's lucky.
I'm not that sensitive to neck width or profile, but do really appreciate the rounded feel of a played in neck.