My 67 P bass (with pickups dated 11/24/66 and 11/27/66) has been played almost daily for 34 years, and saw a lot of studio and stage work before it came into my possession in 1978 (a Christmas present purchased from Leon Rhodes, a Nashville session player).
The neck feels incredible - butter smooth, fast, and thin from tens of thousands of hours of use. The action is near perfect as well, and since the neck hasn't been removed from the body in more than 30 years, it feels like one piece from the bridge to the tuners and oozes mojo from every fret.
Our drummer plays bass in a few tribute bands and has a 90 P bass and a 96 P bass (both American made), and there's no comparison with the very early 67 P bass just because of the way it fits my hand like a tailored glove.
I've played new Alembics, older Ricks, L2 Steinies, recent Jazz basses and other P basses - there really is no comparison.