1. SPEEDThey feature a full-frame sensor with 45.7MP, but the Z8 has a stacked design to allow for faster readout speed, blackout-free live view and drive up to 120fps!
2. DESIGNThe Z7 II is smaller and lighter, but the Z8 has a larger and more comfortable grip. It also features more buttons, and most of them are back-illuminated. The LCD has a 4-way axis mechanism.
3. SHUTTERThe Z8 ditches the mechanical shutter (no physical curtains opening / closing in front of the sensor when taking a photo). Only the electronic shutter is available. The only mechanical curtain you will find is a sensor shield.