I have a set in my Ibanez Prestige - at first I was dissapointed but they have steadily grown on me. I love the 81 for lead, realy clear and it also has a nice burn - very high output, great for solos. Don't like the 85 at the bridge though, its far too bassy, unless you have tone knobs that can mix the front and back pup and give individual tone shaping then the difference is too huge when you flip from neck to bridge.
As I said, active pickups are really starting to grow on me but I still favor Dimarzio. If you are set on EMG's then I would scrap the ZW set and look at a pair of 81's - Kirk Hammet among others use these. Remember Zak Wylde has a refrigerator sized rig behind him generating his tone.