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Both models will output 10-bit N-Log or HDR (HLG) footage to an external recorder, with ProRes RAW supported out of the box and Blackmagic RAW, via Blackmagic Video Assist, available in February 2021. However, it is likely that the Z7 II creates a bit more fuzzy video due to line skipping, so the Z6 II (as with the original Z6) should be a better choice for video.
The bodies are largely unchanged from the original Z6 and Z7, with one major exception. Both now come with two card slots, one for SD UHS II cards and the other for faster XQD or CFexpress cards. That solves one of the biggest problems with the originals – the lack of a second failsafe card slot for mission critical shooting.
Shooting speeds have improved a lot, with the Z6 II now capable of 14fps for reduced-quality 12-bit RAW and continuous single-point AF. More realistically, it can handle 12fps with subject tracking enabled. Meanwhile, the Z7 II can shoot at 10fps, but also with a single autofocus point (and no subject tracking) enabled. Still, those speeds are vastly improved over previous models, as the Z6 could only handle 5.5 fps with continuous autofocus. Better yet, the Z6 II and Z7 II have twice the buffer size, so you can fire bursts for twice as long.