I've played a few basses with both pickup in it.
I've played a Standard 5 with Bart J with the Sadowsky preamp. As MikeBass stated, it sounded like BArts. As compared to Sadowsky Humcancelling J's, the Barts were darker sounding.
<img src="http://www.sadowsky.com/stock/images/2716_full.jpg" width=600>
I put EMG's in my Trans blue Vintage 4. The bass sounded great. It had alittle more of an aggressive sound when compared to the Sadowsky Hum Cancellers but something was missing so I put the original Sadowsky pu's back & I haven't looked back. I was trying to get the Vintage 4 to have the same vibe as my 24 fret 5 with EMG's but it wasen't all there.
<img src="http://www.talkbass.com/photopost/data/501/14993Sadowsky_V4_C-med.JPG">
My 24 fret with EMG's is the bass for me. It sounds totally agrressive. It sounds down right angry when you play a note. When I compared the EMG's to the new Sadowsky SoapBars, the SB's are to mello for the style of music I play. The SB are very warm & punchy & sound fantastic but the EMG's work great in Theorem 7 other projects I've played the bass in.
<img src="http://www.talkbass.com/photopost/data/501/14993Sadowsky_24F5_Fullb-med.jpg">