Once again, I'm looking at the Zf as a potential (gasp) replacement for my M9.
Don't get me wrong, I adore my M9, but the rangefinder window coating has almost completely peeled, making focusing more difficult. The rangefinder may be misaligned, too. Also, my vision isn't what it used to be, so I'm finding precise focusing more tricky with a rangefinder. Autofocus and perhaps a jumbo EVF for manual focus would be of benefit here.
Alternatives include the Leica SL2S with its sensor more suited to M mount lenses and its huge EVF, and another Panasonic S5 or S1 body. The upside of those options over the Zf is that I already have a Panasonic S5, L mount lenses and a L-M adapter. Particularly, another S5 body would allow me to use the same batteries as the S5, although the EVF isn't optimal. The S1 is huge but has a superb EVF, and aftermarket batteries are widely available.
(Edited to add: technically, the S5 I already own is an alternative body to the M9, but I'd like another full frame body to use in tandem with my S5.)
The SL2S brings its own pitfalls, like super expensive batteries, and a used price almost double what a brand new discounted Zf costs right now. It's also considerably larger and heavier than the M9, Zf or S5 II. But damn, I love the colours I've been able to get from SL2S files, and SL2S handling overall is just mmmwah. ❤️ 😘
The extra expensive option would be to buy a secondhand M10 with Visoflex, which isn't in my current budget.
The Zf brings compact lenses like the 40/2, excellent autofocus, relatively compact size, and that fantastic set of controls.
Sigh.