Can someone tell me the characteristics of ebony necks? With sound and feeling. And how do relate and differ from rosewood necks?
Not Much. Ebony Looks really pretty and high end. I might be a TAD smoother on your fingers. A TAD.

Rosewood has a more retro look. As far a sound and tone differences, the fingerboard has virturally no pull.
Framus Cobra
Marshall JCM 900
peavey 5150

Mesa 4x12