I used to use EMGs and only EMGs
Theres more than the MMs for EMG replacement!
BKs I've got since then in bridge positions are:
Miracle man
23k ultra-miracle man
Warpig
Ceramic warpig
And a cold sweat in the neck with the cWP. And some single you wont be interested in.
EQ wise none are the same as an 81.
81s have a ton of high end and high mids, a super-smooth mid and very deep but quite queit bass. They also of course have that in-your-face attack and compression, and only EMGs have quite that sound.
The miracle man has more bass, yet smoother mids and a clear high end thats higher than the 81. Its a fair bit lower gain. It sounds much bigger though, richer and louder. Its has far more prescence in a mix.
The WP sounds like a similar-gain, less in-your-face attack, MUCH bigger, less compressed (but more than a miracle man) sounding 81 if the pig is in basswood and maple and the 81 is in all-mahogany. That should give you some idea of the eqing.
The ceramic warpig is where its at for EMG replacement: equally in your face, equally clear but massively heavier, MORE gain and rips and crushes with equal comfort.
As for the 60, I really like that pickup too; its my favourite humbucker to date. Its got this really-good-clean, really-good-shred thing going on. The cold sweat is the only bk I have for comparison inthe neck and the shred is MUCH better and the cleans are very good; rich and full, but bell-like. But theres something about a 60s clean that does it for me. I dont know what the equivelant would be.
I do occasionally miss the EMG sound (I sold the guitar I had them in: yamaha SG, sounded as good as EMGs are going to sound). But NEVER while I'm playing my BKP'd guitars
No regrets :D