A very short list, which may disappear with firmware updates. These are the things that were added to a Z8 from the Z9 design:
- 10-bit HEIF support
- New Tone mode menu item (SDR/HLG, plus Set Picture Control (HLG))
- Portrait impression balance
- Skin softening function (both still and video)
- AF improvements (dedicated Airplane detection, silhouette focus, smaller face detect)
- USB LAN capability (two USB-C ports: one for USB Power Delivery, one for USB data)
- 30% lighter, smaller than Z9
- With HLG video, Z8 has base ISO of 400, the Z9 at 800 (NLOG both are 800)