My 2 cents worth.
I have had the original and the FP JH13. The JH13 FP has a slight bass boost over the original. To my ears this makes them more musical, where the original could be quite flat without the proper source.
In comparison to my ears I find the JH16 too bass heavy only in that it softens the resolution and masks the detail somewhat. Despite the extra bass and leaving aside the resolution, they are not "Bass Heavy" as in boomy like the Beats are. The bass is only there if required and reaches down very low without distortion.
Listening through my DX90.
If you consider a track like Radiohead - Lucky and listen to the bass: The JH13 - the bass guitar reaches down very deep and is thick and luscious with the reverberation of the strings very noticeable.
The JH16 - the bass is just as deep but much heavier and more powerful and almost makes your teeth rattle!
The JH13 sounds more realistic of a Bass guitar.
With the DX100, the JH13 sound much more powerful - so source does make a difference
So my personal preference for day to day usage are the JH13, with the JH16 used when out on my motorbike as I am not after Uber resolution then.
Re-reading one of the other posts here - there is no Sibilance with the JH13 FP.
Edited by kryten123 - 12/11/14 at 7:03am