I had a norton in the bridge slot of my RG for about a month, decent pickup, just not for mohagany. You could call it satchy, but it's got a little more rip and fullness than the Fred. A nice compromise of The Tone Zone and the Fred actually. It makes lead work sound more responsive and liquid than TTZ, on the downside, if you like to use your bridge pickup for rhythm only, it smears the notes together a bit more than TTZ because of its "unique" midrange, chords still sound open, just not as defined.
Since you said you've used TTZ I think it's safe to say you're in the ballpark definately. In fact, just drop the bottom end chunk out of TTZ and fizz up the mids a bit, and you've got a Norton.
If i had a one pickup "hotrod" axe, the Norton would fill the slot, that's my impression, perhaps only my own.
Mike