IronFilm

@berkenboom As an S1 user, the reasons I would go this route (and very well might) rather than the better-valued S5II: 
44mp (which you note) perhaps better autofocus and perhaps better stabilization finally a good implementation of switching between photo and video modes - huge of me finally Capture One tethering - significant for me On that last point, I doubt C1 tethering will be added to older cameras. I don't think this is a firmware issue so much as a Capture One/Panasonic issue and given the fairly vocal lobbying a bunch of us have pushed toward C1 over the years with no visible response other than "not enough demand", I rather expect that they will not look back at existing Panasonic bodies but might be willing to look forward here on out.
 

At this point, in an uncertain future video-centric model, I don't see how they can put in other video features while leaving the camera body unchanged since this one even though it has the fan seems to be capped. 
Maybe they really need to scale up to a box type camera
 

D'oh!  I meant S5.  Thanks for the correction.  😅
For sure - make.art.now is a big Ronin 4D user which makes sense for his day job of extremely high-end real-estate videos and the occasional TV interview.  I'd keep in mind, though, that this interview which was full of glowing praise for the Ronin 4D was sponsored by DJI themselves.  I'm guessing that the camera's use in the film was organic, but as soon as DJI caught wind of it, they offered to throw a pile of money at the DP and Gibson to have them say just how well it worked.
Though their experience is, from the 4 shoots where I've used the camera now, very true to my own - a well-thought out camera with good ergonomics (provided you have some way to mitigate the weight!) that comes out of the bag and starts making really nice footage immediately - and one of the only gimbal setups where "I'm swapping lenses" doesn't lead to tears and screams of anguish from the rest of the cast/crew.
(Sorry for the topic drift, I just really like mine and I'm not fortunate enough to have DJI paying me a bucket of money to say it)

Yes. But that is running against the fundamental design principle of this camera - minimalism.
After all, anyone who wants/needs EVF, internal ND, IBIS etc etc isn't short of choice. That need is already met. This camera is very clearly intended as a niche product for a design-aware type of audience.
It is (far too)  expensive for the feature set. It is unique at the price.
Choose one.
(Personally, I'm totally fed up with myriads of too-small-to-use buttons and seemingly infinite layers of menus... so definitely the second option for me).

Or an S5 (mk1 or mk2)
 
This was a very interesting interview about the Ronin 4D I just watched tonight:
 

From the reviews seen so far there is everything and nothing.
GU tested it in "lab mode" and slaughtered it. He was smart to report the bugs to Pana who fixed them for him via fw updates.
Other youtubers reported problems found by GU but they didn't get the updates and didn't even know they existed. So people who look at their reviews think it all sucks. For example, some say AF is not up to par. If you look at Richard Wong's review the AF is perfect and aligned with Sony. He has fw 1.0. he is the only one who tested extensively on animals and cars and there are some smart features.
Other youtubers have tried it on real projects or real use cases and there is very little criticism and they speak very highly of it.
Moving the camera left and right like crazy and screaming that the RS is terrible or claiming on paper that having only 12 stops without DR is like swearing in church, seems like bullshit to me. The beloved 5DMKII ML had 9 stops of DR and yet everyone was wetting their pants.
In short, lab is one thing and reality is another.
BTW the same youtubers who now blast the S1RII are the ones who would hate an S1R that we like a lot.

Which is pretty much what every LUMIX user wanted, not 8k.
Even if it’s 8k capable, IMO they should have launched it with up to 6k spec and left everything 8k for the future firmware upgrade.
Except they botched yet another release.
With the S9, it was that stupid f8 lens.
I think 8k at this time is a similar scenario because you want folks talking about what it CAN do.
LUMIX has a problem with the number 8.

I think it's clear: if you prefer RS performance over DR and tools, go for the Sony, Canon, or Nikon (and if you don't mind paying significantly more too). I'm sure there will be in-camera workarounds like with the S5ii (shooting in APSC).
I'm betting the S1rii will get significant improvements over the next 2 years. Who knows what the final product will be by then. However, Sony, Canon, and Nikon are practically WYSIWYG. To get more features, you'll need to shell out another 3 grand or so after selling the old one.

About sensors...I guess that some brands could develop, or financially pay the development, of some Sony sensors, splitting the costs between the brand and Sony Semiconductor by alowing the sensor (or some variation based on the same "foundation") to be sold to some brands after some time.

This was VERY evident with the Sony APS-C 26mp sensor. Sony kept the old 24mp sensor with that horrible rolling shutter for ages in their A6xxx line, and Fujifilm had a 26mp much faster sensor made by Sony. After some years...presto, Sony used a Bayer version with some updates in their A6700 and FX30.

The stacked Nikon Z9/Z9 sensor probably is the same case - developed or codeveloped by Nikon, be exclusive for some time, could be available down the line (and maybe Panasonic is waiting for it for a stacked sensor version of this new camera).

Maybe even the "mysterious" supplier of the 25mp m4/3 sensor of the G9 II / GH7 is Sony too - but Panasonic have an exclusivity clause for it for some time, and that's why OM had to go to the stacked 20mp sensor (and, in reverse, this 20mp stacked is exclusive to OM for some time).

If I had to guess, it's "try to stop the few photographers who are using Panasonic from jumping ship."  At this point, almost nobody who is starting out is going to opt for Panasonic, other than as a value option - and those people are way more likely to go S1 than S1R II.
Though even for those photographers, I'm not sure that about the same number of megapixels and vaguely similar IQ, but nicer (but confusing) video is really a "spend $3,000" sort of thing.
So I guess I'm talking myself out of thinking that this is a good answer to that question.

I think we've disagreed about this in the past and we continue to disagree about it.  The camera reliably performs, in that when it overheats, it warns the user and then shuts down.  And again, at least in Gerald's 21C basement, that was more than 1 hour of continuous recording in the most taxing mode.  He also got it to record for over 4 hours by using an external drive and external power, only shutting it off when it became obvious that it wasn't going to overheat.
This doesn't mean that the camera is unreliable - it means that you should understand your gear and its capabilities before bringing it on a shoot.  If you need to shoot continuous shots lasting more than an hour, use external power and an external drive.  If not, internal battery+storage will probably be fine since the camera will have more time to cool between takes.
Anyway.  It's not a camera for me since it doesn't do anything better than cameras that I already own and I don't have any L mount glass, but if I were an L mount shooter looking for a decent hybrid camera costing less than the Leica flagship, I think it'd be a no-brainer.
 

Nice! I just however got offered a great deal on a 10 inch SDI monitor for only NZ$250 (US$143), so I'll be going for that instead of Viltrox DC-X3

I'm not too bothered about 8K overheating, because has anybody tested overheating in 4K or 6K modes? As if the S1RII is rock solid in those modes, at least you then have an option which works for the types of shoots where you need rock solid reliability.
Yeah people might have unreasonable expectations; simply because Panasonic has been so good in the past they've set expectations for Panasonic very high. 
Does there even exist an 8K hybrid camera that can shoot 8K without overheating??
That's a good way to look at the value of the S1RII

Am glad it supports the DMW-XLR2 audio interface.
Tromsø isn't a cheap place to be living in either, if you're going to be covering people's costs to visit. 
 

I agree.
It's a tool, it's a piece of design engineering and like all designs it's full of compromises necessary to get a product 'out the door' to meet a price target and make enough profit to make it financially worthwhile. Panasonic are basically in the mid-price, good value area of the market, so compromising on the sensor speed (of a hybrid targeted camera) to meet a lower price point than an R5 ii or Z8 seems reasonable to me. In any case the Z8/Z9 sensor might not be available to them, and the R5 ii sensor probably definitely not. It's a mid-range highish-res camera, not a high-end one.
It's launch price is $400 cheaper in cash terms than the S1r was at launch in 2019, which means if you allow for US inflation of 26% over that time it's about 40% cheaper in real terms than the OG S1r - with much better video and AF performance, in a smaller and lighter body.

If we look at S1R II as a photo camera with some advanced video features, then yes it is good. I would choose it over Sony A7R V. As a hybrid camera that can do both video and photo well it is not at Nikon Z8 and Canon R5 II level as those two have lower rolling shutter. Nikon Z8 price is the same, Canon R5 II is more expensive.
S1R II rolling shutter at 6K and 4K 24p/30p is 23ms. Compared to S5 II (21ms) it is basically the same. Not interested in 8K. I am disappointed because was expecting similar to latest Canon and Nikon rolling shutter performance, sensor with faster readout times and improvement over the previous generation. Being also more at the video side I am not sure that 4K 60p and 120P are enough for upgrade. Maybe later when price goes down. I am beginning to realize that at this point in time only Canon and Sony as sensor producers are safe bet in the long run.
Gerald Undone mentioned that Panasonic should consider giving as an option a line skipped version for 6K and 4K 24p/30p in order to improve rolling shutter performance. Line skipped 6K on a 4K timeline may look good. 4K 120p already does the like skipping apparently.
We don't know what are the reasons for Panasonic to choose this sensor. I've heard before that Panasonic may not have access to all sensors Sony semiconductors produces. S1R II has a lot of nice features lets hope sales will be good.
There is a more positive balanced review from Media Division. On at least one 8K and mostly static shots I already can see rolling shutter effect.
https://www.youtube.com/watch?v=v4_oyevhTc8
 

To reference my earlier post, I think that should have happened with the S5X. Along with the differences it has, it should have had 4k 50p FF and the pro 3-way LCD. 

I think so but as a LUMIX, it has to have a gazillion video options.
I get why most manufacturers believe they need to appeal to the broadest base possible, but at the same time, they miss the mark as a result.
Personally, if I was Mr LUMIX, I’d offer 2 cameras at the same time and say, this one is the photo one and this one is the video one and both would be able to tread on each others toes a little, but would otherwise be clearly defined.
Here though we have folks running 8k 1 hour plus tests and calling something a failure because it overheats.
FFS, who needs to record continuously in 8k?

Hmm, it looks like a good camera for a photo first video second pro. I'm the other way around. I really wish they had differentiated the S5X from the S5mk2 by having that 3-way LCD screen and 4k 50p with no crop. That would have made a lot of sense.

I've only seen over heating in 8K running non-stop for an hour. Has it appeared elsewhere? I'm not sure if there are other cameras that can even manage that?

Quick first impressions of the Viltrox DC-X3
Very nice build quality!
Lot's of accessoires included.
The NPF battery sits a bit loosely, not that it will detach, but when shaking the monitor the battery will rattle a bit. Probably not with every DC-X3. (And of course simple fixes for this)
Scrolled through the menu a few seconds, screen seems nice and bright. Wondering however if my unit is really the amount of nits that it claims to be.
The amount of guidelines for aspect ratio's seems very limiting? Just a few options, and no custom option if I'm not mistaken. Will look further into this when I have more time.

This is one of those instances where it feels like Lumix is damned if they do, damned if they don't. They gave their high resolution stills oriented line a huge video upgrade, holding back very little, and it's still not enough to satisfy a lot of folks. This is a very capable video camera for a camera that is meant for still/hybrid shooters.
The only thing that is unacceptable to me, and it's a very big thing, is the overheating. 
 

I think that pretty much agree.
I also agree with Gerald Undone's comment that it should have a general no-oversampling/low rolling shutter option in addition to the normal/extended DR switch. The (line-skipped) 4k120p is around 8ms RS, so we know it's possible, albeit with less DR and less sharpness etc.
But at the price (which will fall to sub-$3000 probably fairly quickly), it seems like a lot of camera for the money. If you want 8k video with much lower RS, go buy a more expensive camera...

8k is so overkill. When shooting raw, 8k eats too much storage.
Best news of this camera is no crop 60fps 4k! Finally panasonic has done it.
But I wont upgrade from s5ii zs qi dont see the need. The footage doesnt seem that much better vs the s5ii.

Ed Prosser has the best video-focused review I've seen thus far 
 

Colors and skintones look better than the s5ii and seem closer to the first gen S models. Less magenta bias too. This is a big one for me. I like the new A2 profile, too.
Despite the higher MP drawbacks we all predicted, I'm looking beyond: the supposed video-oriented camera on the way just may be the one.
Last thing I'm looking to see is if the compressed recording options are plagued with the same processing issues as the s5ii.