Although the EMG-85 Humbucker has more measurable output than the 81, its frequency response and string interface are different. The 85 uses two Alnico magnet-loaded coils with a wide aperture to maintain a beefy low end and a fatter top end. Because of a more natural tone, it works great as a rhythm and blues pickup because it has loads of output but isn't muddy. It's a perfect choice as a rhythm pickup in combination with an 81 in the bridge.
The midrange has great definition and doesn't get foggy or muddy in the rhythm position. The EMG-85 guitar pickup works best if you like the natural distortion that comes from overdriving the front end of your amp. Under any condition, it responds accurately to your technique.
EMG EMG-85 Humbucking Active Guitar Pickup Specifications: