I hate to say this....but cancel the Z5.
The Z5II is coming very soon and will have the FAR superior AF module along with many other advantages. Not only will it be a better camera, it also crush the resale value of the old Z5.
Z5 was okay, but the AF was well behind. Z bodies have evolved into amazing cameras and the Z5II will be part of that very good company.
If you can't afford the new version it would probably be worth saving up for.
Robert
I've pulled this post up as a good example of very poor 'advice'. The OP has already bought the Z5 it seems, and at £615, an utter steal. So let's examine why telling someone to 'cancel' the Z5 is such bad advice:
AF: the Z5 already has excellent AF, if you put it into a wider perspective. Certainly, the camera can focus far quicker than you can. As someone who learned on film, with very basic and clunky old cameras with absolutely no automation at all, and who has shot sports on a fully manual camera with no AF, I can tell you that there is no bad modern AF system. As for the Z5ii having a 'far superior' AF system; the actual differences in real world shooting will be slight, not so significant. My Z50ii andZ8 aren't so far ahead of my Z6 in practical use. Things like Eye AF are slightly better; a little faster and more accurate. But definitely not FAR superior in my view. I'm not getting significantly better results with the newer cameras.
Take time to learn how the AF system works, and experiment. Try things out to see what works best for you; I like Eye AF, but find some other modes to be a waste of time for how I shoot. Even in fast moving, extremely challenging environments (I shoot a lot in nightclubs), I find the AF systems to work pretty well, and there's always manual focus as backup; I think a lot of younger photographers who grew up in the AF era just aren't experienced with how to focus accurately in manual mode. And remember, nothing is perfect. Try to imagine AF performance on a scale of 1 to 10; the earliest systems were around say 3 or 4 in terms of speed and efficiency (compared to manual focussing at 1), but todays systems are like 9+. so the AF in the Z5ii might go from 9.5 to 9.6. The incremental performance increase is much smaller than we saw in the earlier days of AF; AF performance could jump from 4 to 5, say, with a single generational update. Much bigger leaps.
Regarding the most important aspect, image quality, the Z5ii probably won't offer anything above the Z5 in any practical terms; in-camera noise reduction might be a little better, teeny bit more dynamic range, but nothing that will impact on the quality of your pictures. Remember that even the most critical reviewers were raving about how good cameras were 5 years ago or whatever; they haven't suddenly become terrible.
So yeah; the Z5 for that price is an exceptional deal. The Z5ii may well come in getting towards 3x the price; for that 'saving', you can buy a couple of lenses perhaps. That would make a far more significant impact on your photography than an AF system that might be 5% quicker (and we're already talking fractions of a second here anyway).
When giving advice, try to think about what the person asking for it actually needs to hear, not what YOU want. If a person says they can't afford the newer model, don't tell them to 'save up' for it, this is crap. They could be out taking pictures in that time. And that's all that matters, quite frankly.
