I use Shure 840 pads on Z1000. It is slightly larger, so more room for ears; it also brings out more bass and a bit echo (or, you can call it bigger soundstage.) Basically Shure 840 pads is more comfortable and keeps most of sound signature. I also have Shure 940 pads, it muffs the sound. Beyer Velour pads just does not sound right at all.
I use Beyer Gel pads for ZX700 - bass, bass, more bass.
By the way, Z1000 pads fit ZX700. You can call Sony Pro to buy it, but I am not sure they have it, or not.
Edit: Shure 840 pads are not perfect fit for Z1000 or ZX700, it is wider. I'll take photos later.