I've found this to be the case also in ALMOST every circumstance. In an old victorian house, with knob and tube wiring, it was the opposite case! Really freaked me out.I find the opposite to be the case, the MFDs used in my ASATs and S500s are less noisy than standard single coil pickups while being louder and fuller in tone.
+1For whatever it's worth, I've found that any G&L is like a Fender+. That is, if you like a particular Fender model, you'll like the G&L analogue a little more.
+1 I've owned 3 ASAT Classics that all squealed like a pig. I called G&L and they even sent me a new set that did the exact same thing. I just bought a ASAT Special and the frets have already popped up. I have to have them re-glued. I don't know what's up with G&L but they need to get their act together.I had an ASAT classic and the bridge pickup was the most microphonic I've ever had. Normally I'd have trouble getting feedback out of a solid body guitar, this one would squeal if you looked at it funny.