The Mamiya ZE-2 is slightly modified ZE - in addition to the A mode (aperture priority) it has a proper shutter dial (1s to 1/1000s) and therefore a proper manual mode (M mode). All other properties are the same as with the ZE (including the +/- 2 EV override and the AE Lock mode). Of course an camera with A and M mode is much more versatile, and therefore I would recommend to get ZE-2 (or the more reliable ZM) if you want a body for yout Sekor E lenses.

As with the ZE, also the ZE-2 has a quite fragile body; especially the hotshoe can break off, and the electronics are susceptible to damage.