SRV1981

Just like you pick the appropriate FoV to tell the story that needs to be told for that shot, you also need to pick the appropriate DoF that matches what the film needs. 
Once you've got that equal for both, then compared to the FX30 any FF camera is going to be at a one stop disadvantage (all else being equal). 
The other alternative is ignore the resulting DoF difference between the two cameras, make the 1st AC hate you, make the Art and Location Departments' work go to waste, and let the actors be lost in the bland blurred space they're in. 
Moral of the story is: you can't only look at a FF cameras' strengths while totally ignoring their handicaps. 
To make it fair comparison when discussing the noise performance that has to be taken into account. 
If you don't need to work with other people (i.e. Sony shooters!), and don't need TC (I work with that on basically every shoot! Very very very rare I don't), then it sounds like the S5mk2 is the perfect camera to shoot with for you!

Are you normalizing for DoF? No, you're not. 
Are you considering which has the more practical second ISO?
Mainly only if you really want that EVF and/or mechanical shutter? Plus backeting / bursts / etc
If so, pick up a second body (the Sony a6000) for your stills for dirt dirt cheap? Depends on what type of photography you're doing, and how seriously. (casual family photographs? The FX30 is "fine". Hard core serious sports photography? Don't even get any Sony! Grab a cheap secondhand Nikon D500 with a Nikon 200-500mm lens, and say the Sigma 50-150mm as your secondary lens for when the action is closer to you. Or just get a Nikon 55-300mm for dirt cheap as your only lens if you don't need more reach than 200mm and shooting outdoors with lots of light)
Seems like it!! 
A pity Panasonic screwed up and forgot Timecode, like the S1/S1H/GH5S/GH6 all have!
Honestly (in my very biased opinion), I'd rather that as an even bigger issue with the S5 mk1 than its AF. 
  
The FX30 beats the a7Smk3 for TC/audio/features/UI as a better camera for video work, cheaper too. 
 

Its real - I got a newsletter from Vistek with pre-order details for S5II & S5IIX... Feb 24 delivery date.
I don't know anything about AF though... nor do I know of the real differences between the first gen and second gen.
Wait for the reviews I guess.

Editted to add: Vistek is a camera store here in Canada, its on par to Henrys (but there are way more Henrys than Vistek). Imagine - Bestbuy only for camera equipment (photo & video).

After the powerfull S5mk2 presentation I just wanted to summarize some cons and pros for both systems from perspective of a guy who owns a Sony camera but switched from GH5 mainly cos of the reliabilty issiues with Panny AF. 
Now ofc we need to take into account that S5mk2 is a baseline new Panny camera with PDAF. They will defeintly introduce updates to the rest of their lineup and it would be much easier to make up your mind in the future when we see all those camers. Nevertheless I just want to lay out what I already can see at the current market position. So this comparison not gonna be very camera specific as obviosly A7S3 beats S5mk2 in terms of rolling shutter and FF resolutions cos Sony is a leader of camera sensor production and they keep their best and newest sensors for themselfs exclusively. Ok lets do it:
Sony
Pros:
- Lens lineup. Yes, an obvious one. E-mount has the strongest lens selection, with tons of options from a plethora of manufcatures. Tamron zooms are awesome and unique. Samyang primes are tiny, awesome and affordable. Sony lenses are quite compact themselfs (compared to Pany its noticable). And they all work more or less the same on Sony cameras. 
- Compactness of the system. You can have a very compact kit with a Sony camera. Both their bodies and lens selection lets you build a very manageable system in terms of size and weight
- Recorded gyro data. That is a pretty cool option. I am currently experimenting with it using GyroFlow which is a much better software than the infamous CatsalystBrowse, I will share my experience on the topic later. Gyroflow already has a Resolve plug-in but its not that great. Future iterations might improve significantly. 
- Sony will always have the latest Sony sensor tech and that is a big factor of their sucesess
And I kind of ran of out pros at this moment 🙂
Cons:
- FIRMWARE updates almost never happen. Thats a very big downside for me cos I hate when companies treat their customers mostly like milking moneybags . And that seems to be a strategy here. 
- A very limited amount of video specific tools. Maybe you want false color, waveforms, shutter angle, opengate recording? Well keep dreaming or buy a Sony higher tier "proper cinema camera" for that. I guess FX3\30 does not classify as one. 
- IBIS is meeh unless you are using post-gyro stabilization which works only in specific modes (doesnt work in S&Q for example or 120fps)
- Body ergomonics is meeh
- HDMI output feed is terribly desgined. Panasonic wins here by a mile. 
In general Sony makes an impression of company that is not vert keen on listenning to their customers feedback and they would prefer to milk all of them to the last drop than to make them happy giving some relevant camera updates and showing some feedback and ability to listen. And for me its an important trait that I react to. 
Panny boy:
Pros:
- the new IBIS is just FUCKING AMAZING! Bravo Panny! You took it to the next level truly. 
- Panny update policy is one of the best in the buisness. You can rest assured that your camera will get relivant updates for the next 2-3 years or more with some sudden surpises along the way. 
- Panny ergonomics is quite good
- their HDMI output layout is great!
- All the video orieneted features that Sony is missing, Panny is actively adding to their cameras
Cons:
- Lenses. The obvious one. They are big, they are expensive, they are limited in variety. But.. their quality is quite good. Focus breathing compensation build-in is very appreciated. And Sigma lenses giving the system some lighter and cheaper options in nice. So its not all that bad but Sony still wins here quite firmly.
- no PDAF.. haha. Well that in the past now. Huge con elliminated finally
What else? Well we need to see the all new lineup refreshed to make an adequte judgement here so the time will tell. But for now Panasonic just raised from the underdog to a strong contender in my eyes. 
---
Border line. For now purely as a company Panny wins in my eyes. They are just more user friendly and video oriented and innovative beyond just sensor tech innovation. 

It looks like you will be able to upgrade the S5II to get some (but not all) of the features of the S5II X.
 
Also Geeky Nerdy Tech is in Australia, where it's summer, and says there's no overheating issues, which is nice.
 

Holy shit - looks like Panasonic have a winner, at least for the price. If only Panasonic had PDAF since the beginning of the L mount, market could be very different now.

Looks like @MrSMW will be a happy camper. And, if I had the intention to move to FF, as an amateur, this could be my number one choice.

hey, i am doing the same type of shoots with my a7IV and have never had a problem with overheating. I think you will be just fine with this camera. Sincerely, the only down size of a74 vs fx30 is the rolling shutter which sometimes can be annoying for panning and camera moves. Other than that, there is no real difference in the work you'll be doing. And with the a74 you'll get full frame and the photo side.
Again, had no problem with overheating and was doing shots in Africa in December last year. Check out my film and if the quality suits you, go for this camera. My film here:
 

Let us all not waste any time with getting into unfriendly arguments. Why feed a negative vibe with another person, feeding it to eachother! There is plenty opportunity to not to get involved in using unkind words. There are plenty of kind and interesting people communicating on this forum. Please, everyone, let´s all keep our act together.
Citing Steve Yedlin, is a good start imho.
Hey, don´t make me test myself to film a blank wall with my S1. 🙂 So I am very grateful for findings and fantastic insights along the way.
 

So I just completed a trade with MPB and I actually am quite satisfied. What really impressed me is that they actually paid me MORE than the original quote, because they judged that my equipment was in better shape than I did! So in addition to getting a S5 I actually ended up getting about $200 more!
I made a bit less than if I would've sold it on eBay or myself, but it was so easy and convenient that it was worth it to me. Just thought I'd share.

If you're in North America, I'd use Fred Miranda's buy/sell board. Check price history with recent listings, be very honest about the condition and post lots of photos. I've bought and sold dozens of cameras and lenses over the last 10 years there.
Screw eBay. Too many reports of buyers claiming they weren't shipped the items and getting full refunds with ebay's buyer protection. And there's no way to dispute if its a fake claim. Hell no, I would never sell anything of value on eBay. Marketplace is a dumpster fire of scammers. Its tiresome with all the "kindly send me your info" scam BS. 
Chris

Note:
I AM NOT TRYING TO SELL MY GEAR ON THIS FORUM, THIS THREAD IS PURELY FOR ADVICE

Looks like pro res with the X and it’s a blacked out stealth finish plus probably at least one CF Express B slot.
Anything else/everything we’ll find out in a couple of days I guess…

Sounds like a dick measuring contest. Have you actually read any of the arguments I was making in this thread? My comments on telephoto advantages of M43? My list of compared lenses? I gues you did not or it slipped your attention somehow. I think I am gonna end this discussion right here. 

Yes, PDAF, improved colors and rolling shutter are what I want. I'm not in love with the GH6, but the rolling shutter and colors (IMO) are better than on my S1.

I think the FX30 does pretty well in low light. But I think you'd be fine with the A7IV. 
I'm biased towards the S5 though. 🙂

Yes, EIS & OIS...

*DIS (EIS whatever)
While walking, no miracles, gimbal instead.

Yeah, at this point in camera development I think resolution is less an issue you'll have and really just shooting at an appropriate shutter speed and hitting focus is what you'll need to worry about.
Especially for social media use. The examples above aren't amazing by any stretch, especially given the lighting, but the performers will often geek out over the shots and use them on their social media accounts too. No one seems to notice, or really care, that they are stills taken from a video file. Most people at our level in pro-wrestling are using pictures taken on phones, and I'd argue our stills from videos look better than most pictures taken on a phone because they still have the characteristics of a larger sensor image.

Sony a7 iv 4K 60p is inferior to that from the fx30: it is crop mode with oversampling from 4.2K  The fx30 does 4K 60p from the full AOS-C sensor, thus 6K oversampling. 4K 120p on the a7 iv is 8 bit, that from the fx3 is 10bit. The fx30 has a power zoom rocker level on the body, a fan, and the more integrated digital audio adapter.

What kind of video are you doing? Will you be filming long takes? Do you live in a warmer climate? The A7IV does have some overheating issues. However, if you aren't shooting long takes (say longer than 30-45 minutes at a time) or aren't in a hot climate, you'll probably be fine.
The FX30 eliminates overheating issues like that, which is why you'd want to go that direction if you're primarily a video shooter. It's a video ("cinema" 😏) camera, so it's meant to be a reliable video camera.

AF/MF...either way, if it ain't in focus video-wise, it won't be in focus as a still.
From experience, ie, I have deliberately shot video (4k 50p APSC crop S5 flat profile) with a view to also pulling the stills of the same footage and the results were mostly 'good' on average.
Some instances, they were great.
Tried the 6k 25p mode and the quality was mostly higher still and I think if someone was more 'results focused' than 'craft focused', with something like a Z9, the results would be superb.
And by 'craft focused', I mean that I am not sure whether I would be happy no longer being a photographer...
Can it be done? Yes and I'm surprised more are not doing it.
Should it be done? Personal choice more than anything.

What shutter speed do you usually use when taking photographs? If beyond 1/50 I would get a black magic for video and a dedicated stills camera for photos. It’s all about trade offs and what you’re willing to accept, also it’s nice to be able to shoot in portrait mode. I like having two systems as I feel it’s two different ways of thinking about image capture. Good luck

If it’s stabilised or even faster shutter speeds needed!

R5C