I wouldnt (and dont) pigeon hole either pickup into lead or rhythm: both can do a great job of both, and bring different qualities to it. But I would agree generally with Black Fire.
AND the 81s have more mids.
As general tonal character goes the MM is a better comparison, but has noticable amount less gain: where I can A/B my pig and 81 within seconds, I hear the 81 have a shade more gain; if I left it 5 minutes, they'd seem the same, whereas a miracle man just has less, end of: you can tell all the time.
And seeing as I love my gain, I just sent my double screw pole miracle man in to be rewound to warpig level :twisted: (or higher if the existing tone isnt compromised: I left that to Tims judgement).
Should be a MONSTER! Cant wait to play the beast :D