The DT880cb with DT770 pads are more comfortable to start with.
The sound is snappier, details are jumping at you, which is the nature of the DT880.
The ZMF are fuller sounding in the mids, more relaxed, easier on the treble.
I don't find the Alpha pads as comfortable as other do, the opening of the pads is too small for my big ears.
BTW: Zach is now offering painted ZMF's!