Sorry to bring this up again. I don't see how the 940's could leak that much. With my iPod Touch (50% maximum volume) connected to a FiiO E7 (max volume of 60), the leakage is noticeable from 3 feet away. This volume level is louder than I would listen to while riding in a noisy public bus. Cutting the iPod Touch's volume to 30% of maximum volume (which more like the volume level I would listen to while on a bus), there is hardly any noise leakage at all until you get within inches of the earcups.
Unless you listen to your music at a level loud enough for public transit, or the earups didn't have a good fit on your head, I don't see how you could possibly have so much leakage in a quiet environment.
These observations were done using a fairly loud 256kbps VBR R&B/soul songs.
I don't think that anyone would argue the fact that pleather generally isolates better than velour. I don't know how much sound leakage there actually was, but all other things being equal, my wife complained about the 940 and said she could hear sounds from the headphones. I seldom get this complaint about the 840. Not scientific or measured, but it did happen just about every time she was around and I was using them. Good thing I didn't try the Denon D5000.