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Minor point - the S9 *does* have a 3.5mm mic input jack (but no headphone jack).

It's hard to say which one is better - they are both excellent but behave differently. I think the OM1 is better at working out what you a doing e.g. are you panning (when it lets the stabilization 'flow') or stationary (when it tries to hold it static). The amount of crop the OM1 adds in e-stabilization is less than the S9 adds in 'high' e-stabilization mode, but the probably S9 degrades the image less in that situation. Really, the big difference between the two cameras (ignoring the lack of EVF and mechanical shutter plus the limited physical controls on the S9) is that the OM1 is maybe 80% stills and 20% video orientated, where the S9 is more like 60% video and 40% stills. The OM1 is very well built, feels great in the hand, is fully weather-sealed etc. but you'll curse it's video limitations at some point. For example, to get the sharpest video you need to use 10-bit mode, but that is *only* available as 4:2:0 HEVC in either HLG or OMLog400, and you can't adjust anything in those modes. The 8-bit modes are basically the same as the E-M1 iii, but the output looks a bit cleaner. There is no way to save custom sets of video settings - the custom sets only work for stills, but at least most settings are kept separate between stills and video modes, including button and control wheel customizations.

I currently own an E-M1 iii and OM-1 (mk1). I'd just get a used OM-1 and the 12-40mm F2.8. It's just a great combo for handheld video. If you want even better stabilization, use the 12-100mm F4 instead as that supports Sync-IS (Oly/OM equivalent of Dual-IS), but it has the downside of extra size and weight. Having recently acquired a Pana S9 I still think Oly/OM has the best stabilization - it's almost uncannily good sometimes - but the S9 runs it pretty close most of the time. Main difference for me is that the S9 needs more decisions about which stabilization modes to use in a particular situation, whereas with the OM-1 + 12-40mm I usually enable sensor + e-stabilization (M-IS 1) to minimise corner-warping and set the stabilization level to +1 and let it work out the rest for itself. With the 12-100mm the Sync-IS means sensor-shift only stabilization (M-IS 2) is much more usable at the wide end and stabilization level 0 is usually enough (which is more flowing/less sticky).

Follow the link at the top of the first post.

The Optyczne.pl 'movie mode test' review is here - https://www.optyczne.pl/110.1-Inne_testy-Sony_A7_V_-_test_trybu_filmowego_Wstęp.html

They had an FX2-like body design (including a flip-up, multi-angle EVF) 9 years ago in the form of the GX8 - https://www.dpreview.com/reviews/panasonic-lumix-dmc-gx8-review/3

'Slow' USB chargers definitely exist (I use them myself) e.g. https://www.amazon.co.uk/JJC-Battery-Charger-Olympus-Cameras/dp/B08DR6BY2Z and https://www.amazon.co.uk/Ayex-Charger-Olympus-BLH-1-Batteries/dp/B07BSWH8QN

My experience with E-M1 iii is that the battery life is pretty good (certainly compared to some Panasonic M43 cameras I've owned), but I would always take a spare battery with me if I was planning to shoot a reasonable amount of video. (That's a nicely kept red Citroën Ami on the left of the 2nd photo - brings back memories of the later Citroën Visa that my wife owned years ago, powered by a 650cc air-cooled 2-cylinder engine. At only 35bhp It was rather underpowered but that made it great fun to drive - just to make reasonable progress you had to thrash it hard and overtaking needed serious forward planning 😀)

I've never owned a Fuji camera myself, but one major reason I haven't is that many of their cameras don't support 'plug-in power' for external mics, which some camera-mount mics need (or can detect to perform auto mic on/off). You need to check the user manuals carefully if that's important to you. The X-M5 does appear to support it (but e.g. the X-T50 doesn't), so maybe future cameras will as well.

I agree completely. With smaller/lighter lenses like the Sigma 18-50 f2.8 APS-C I find the S9 well balanced and easy to hold, with left hand under the lens and right hand around the body. I have (but don't use very often) the Sirui grip, which is deeper than the Smallrig one and has a high-grip surface on the 'bump' - this is someone else's comparison photo of (top to bottom) the Sirui, JJC and Smallrig grips Even with a (small/light/decent sounding) Sennheiser MKE200 mic mounted on the cold shoe the combo still feels relatively small and light, which is exactly what I wanted when I bought the S9.

Having bought the Sigma for my S9 (largely because of your enthusiasm for it 🙂) I have to 100% agree - it's a perfect companion to the S9 in size and weight, with nice smooth zoom and focus rings. As I normally shoot video in 4k50p which forces an APS-C crop anyway, it being an APS-C lens is actually a plus for me as it forces APS-C for everything so I don't have to deal with changes in viewing angle between stills and video. The 12MP APS-C stills are OK for my purposes, and I have the compact FF 18-40 f4.5-6.3 if I really feel the need for 24MP stills. So I tend to regard my S9 as an APS-C camera with a bonus FF stills mode 🙂. The adaptor is only doing what it's supposed to do with an APS-C lens on the front, same as using a native L-mount APS-C lens (e.g. the Sigma 18-50 f2.8).

I suspect that's because the in-camera LUT is processing the video before it's compressed, but in post you are working video after compression (which is likely to have reduced or smoothed over some detail, depending on picture content and bitrates).

I own and use both. The Oly 12-100mm F4 is a great lens, but it's much bigger and heavier than the Pana 14-140mm (560g versus 265g) - both on an OM-1: On an E-M1 ii/iii or OM-1 the 12-100mm supports Sync-IS which gives sublime video IS performance, but even with the relatively light (for that kind of camera) OM-1, the combo is 1.2 kg and somewhat front-heavy if you're using it handheld. A GH7 + 12-100mm would be nearly 1.4 kg. As a 'travel' lens, IMHO the combination of low weight and focal length range makes the 14-140mm almost perfect (other than in really low light, of course).

The G9 ii is much larger and over 50% heavier than an OM-5: The obvious M43 alternative (larger and heavier, but not as bad as the G9 ii) is a used OM-1 - almost a steal at it's current sub-£1000 used prices in the UK for what you get in a rugged, weather-sealed, reasonably compact body. And of course as MrSMW said, there's the S9 at sub-£1000 new, but that's not weather-sealed nor has an EVF. It's the lack of a compact M43 body with PDAF, 4k50/4k60 and excellent video IBIS that drove me to buy an S9 - my first ever non-M43 MILC (after 13 years of buying M43 cameras and owning a sizeable lens M43 collection). That said, the E-M5iii/OM-5/OM-5ii series aren't really aimed at the video-user market - they are primarily lightweight, small, weather-sealed stills-orientated cameras with a bit of retro style (which is an OM-System self-confessed niche, really).

As 'newfoundmass' suggested, use the touch screen, or (probably, for movie mode, as the manual doesn't make it clear if it applies to movies as well as stills) you can use/customise the functions of the front and rear dials: