I'm surprised there hasn't been more people turning their Q701 into a K702 65th Anniversary. Cost of the pads is now only $65 or so from what i've read.
I think though that stock the Q701 + Annie pads is probably more muffled/warmer (so little it's barely audible) than the Anniversary until you remove the grill foam. Male dialogue in games sound noticeably worse (fuller but more muffled) without removing the foam.
I did more experimenting with that yesterday when I was bored. Adding in the Q701 button and foam is actually the same result as closing off the grill (to my ears). It's definitely not placebo.
I bet I could get very close to the Q701 sound using Anniversary pads with no foam over the driver and in the grill. I'd love to get the EXACT Q701 sound with the Anniversary pads. I don't think it's possible. The closer the better since I prefer flat pads. Q701 pads are sometimes more comfortable since they don't get as hot and go flat.
I really wish someone could measure the K712 or Anniversary edition. I'm pretty positive there won't be even close to 3db of difference in the bass.