I can' compare with old JP models (my first question above is still valid...), but what I can tell you is that yesterday I compared a Majesty with a BFR Koa of 2012. Both necks are the same. The figures given by Willy above are correct (I measured it, from back of the neck to fretboard, so fret excluded).
For me, comparing to my main guitar that was so far a Strat, yes there is a huge difference in feel. This Majesty neck has really something great.
I hope this helps, and if anybody can make a comparison with old JP models that could be great indeed.
And by the way, the Majesty is really a wonderful instrument. I just bought mine (a used one - the owner didn't like it so much fortunately for me- , that still smells like fresh from the factory) yesterday so I can't give a constructive feedback, I'm still in the honey moon phase ;-)