noone

Daft blanket statement. Depends on how you make money as a photographer.  I'm a "professional" (I make my living from photo/video). I shot on a d5300 for a few years lol. I used to do a bit of teaching and many amatures/enthusiasts had 5x the dollar amount of my kit. 
I'll be keeping a beady eye on overheating in high ambient conditions though. Crap loads of sun and 35+degree days are common in Aus.

Yep. The downsampled 4k at 24 and 30p is only a one time 30 minute record limit. Assuming that means you can't just hit record again after. 

Someone will probably come up with a conspiracy theory that Sony is paying all reviewers to hate on Canon while sending unlimited praise to their camera. 
When I first heard about the overheating I was fine with it. Its pretty normal across the board at this point. I thought 8k really isn't needed much most people will be using 4k regardless. But it just gets worse and worse. 2 hour waits to cool down, overheating in an air conditioned room. Overheating just from shooting stills, not even recording any video?

I am sure these limitations will work for some people but definitely not for me. 

I do not think anybody is giving it a blanket pass.
Just something very different to the Canon.
It isn't they overheat as ANY small camera that uses that much power with those sensor sizes and does not have an active cooling system will have a point it overheats.
 
The issue with the Canon is once it overheats it seems to stay over heated for longer than is good and that even shooting stills reduces shooting time.
If all you DO need with the Sony is an umbrella or anything just to keep it out of direct sun for external heat, that is fine in my book and Sony seems to deal with the internal heat build up better between these two. 
To me, it is as if comparing a litre of boiling water in a thermos (Canon) VS a litre of boiling water in a glass bottle (Sony).     After an hour the thermos is still going to have hot water, the glass bottle will be room temp.
Take the two out into direct sun after that hour and the water in the glass will get warmer while the water in the thermos will still be the same...now if you apply another heat source internally (while leaving them in direct sun), the water in both will get hotter and the glass   will also have the effect of the sun added to the internal heat. ...but the glass will cool down again quicker too again.

This is not a professional tool. I'm sorry, but if it overheats then it cannot be used in a professional setting. Will be fine for youtubers and people doing stuff for personal hobby and such. But not a serious paid professional. 
The amount of hypocrisy in this forum is bewildering. Everyone giving it a pass left and right. Yes, it matters if it overheats only in direct sun lol. If I am shooting anywhere outside there is a good chance I will be in the direct sun, unless I confine myself to shade. 

BUT Only in the limited circumstance of direct sun (probably a direct heat source) so all you have to do is not have it in direct sun (umbrella or anything to keep it out) and then it will work.
I think it is also going to cool down faster.
As i said above, the Canon must be well insulated and so the heat can not get out and the heat build up comes from within the camera and once it stops, it takes a long while to cool down (because it is so well insulated).
The Sony works fine it seems when not in direct sun so the heat from within the camera is handled better and prbably because the camera is less insulated, the heat gets out faster (but that also means it gets in from an external source too).
It could just be as someone said Sony is being tricked into shutting down by the increased temp from outside.
 
It may well be that all the Canon needs is a couple of holes drilled in the body?    Maybe the MK ii Canon can have a weather sealed door that can be opened up to let heat out?

While Bloom says he was paid by Sony to make the two videos  linked in this thread I still think he is happy to give warts and all.
He had it for a while and that he says "This is a FANTASTIC camera, the image is stunning, it is a joy to use and I have done very extensive overheating tests (again in my review) that will impress the crap out of you!"   pretty much puts to bed an issue on overheating as an issue for me (though of course want to see the tests).
This is MY camera (in 2021 or 2022 more likely unless I find a couple of grand in the couch).

What with Blackmagic giving us 12K, Canon 8K and Sony 10bit 4K finally, plus they're offering 120fps 4K as well; these are crazy times...  So many new cameras with crazy specs to tempt us... 
And yet thanks to Covid, I'm so broke, I can't even buy a Panasonic G100 if I wanted to.  (Which I don't).  This year has been weird and crazy... 
Who'd have thought we'd be talking now about Canon cameras overheating and Sony being the more reliable camera for filming...  

Very likely that the Sony is (incorrectly?) being sounded for overheating by the direct sunlight, mistaking it for sensor overheating (since the body records the temperature, it mistakes dissipation from the sensor to direct heating of the body).
That's an interesting little circus trick that the Sony has. 

a) a cage will help to dissipate heat in direct sunlight
b) also some white dbrand skin or similar should help

16 bit raw recorded as 12 bit Log ProRes RAW? This is the only camera to do this right? Guessing it doesn’t really matter though for 99% of cases.
 
(from Atomos press release)

Let's not forget the low-light capabilities of this camera. Northern lights in real-time!

I don’t get all the negativity.
This is a very sensible camera from Sony as long as it doesn’t overheat and ruin a real world shoot. Everybody wanted a FF 4K60p 10-bit camera. We have it now. With excellent AF, ALL-I, log, no pixel binning in sight (!) and hopefully no overheating in practical terms.
Sure, the flip screen is low resolution and rubbish. The menus are straight out of kindergarden classroom. And its only 12MP. Who cares. It’s about the sausage in the end.
I hate to say it but Sony is probably going to be the company to give us that internal eND in a mirrorless body someday.

I honestly don't understand why people are feeling "very underwhelmed" by this camera, what do you expect? I feel the Canon R5 has seriously skewed expectations, but we know in the real world how this has burnt (sorry) potential buyers.
Who gives a monkey's if it doesn't have 8k?
No other camera in this price range does what this camera does. In some ways it's better than the FX9. Seems like the perfect video tool for those who don't want or can afford something bigger. 
Well done Sony! (and please, no hush-hush cripple hammers!!).

While some of you are underwhelmed, I'm elated as long as 4k 120p works as stated. I've been hoping for a camera that can do that along with excellent autofocus. Great for wildlife filming! Yes, 30 min limitation but I can live with that as long as I don't have to shut the camera off afterwards to let it cool down for 2 hours. I'm being cautiously optimistic.
 

Once again Im astounded by the pricing. A few years ago people were paying £5000+ for Canon 1D series cameras. The capabilities of the A7S III are off the charts and yet still in a small form factor, at under £5000. What a time to be alive. 

Who knows, maybe Sony will sell you a fridge to keep your Canon camera in?

Nokishita just tweeted out a link to an unlistied Youtube B&H review of the a7s3 that froze about 10-minutes after I started watching. The video is now private. I'm cancelling the R5 order and selling my EOS R to stick with Sony. This will be my video workhorse.
A summary:
A few flavors of XAVC including all-I and Long GOP in 4k and HD.
You pick the level of compression, then the resolution, then framerate - from what I remember every bitrate option can record all resolutions and framerates.
The tester couldn't get it to overheat at 4k60p after over an hour of recording outside in the sun.
Same color science as the FX9 and Venice.
The goofy colored new menus SAR had are real, full touchscreen navigation.
All framerates are 10-bit 4:2:2 internal including 120fps, though the max 600mbps needs V90 cards.
Full AF with all framerates, a more Canon-like touchscreen for AF.
The AF points in that leaked doc are correct 700+ PDAF and another 400+ CDAF.
External 16-bit raw is real, though they don't know how its actually gonna be recorded.
No pans but he said rolling shutter is pretty much eliminated.
IBIS is the reported 5.5 stops, looks like the same Sony IBIS.
Has the ZV1 digital stabilization and the FX9 metadata stabilization - this is what he was talking about when the video froze.
He didn't get to the EVF
Looking forward to the announcement.
Chris
 
 

Maybe, as long as it doesn't barbeque the memory cards, like the competition 😉

Nokishita leaked a press sheet:
At the heart of the new Alpha is a 12 megapixel full-frame sensor that has been improved compared to the Alpha 7S II. Sony is now opting for a construction with back exposure (BSI), with which more light can be captured and which enables better results with low light shots. The maximum sensitivity is still ISO 409.600 (expandable down to up to ISO 40). The sensor is supported by the new BIONZ-XR processor, which is said to have eight times as much computing power as the previous image processor. Sony is also breaking new ground in operation: For the first time in the Alpha 7 series, a fully moveable monitor (3.0 inches, 1.44 million points) was installed, which now also allows touch operation of the menus. The structure of the menus has also been completely revised; among other things, only the relevant entries are available in photo and video mode for better clarity. The OLED viewfinder achieves a record resolution of 9.44 million points and a magnification of 0.9x. Even glasses wearers have the entire picture in view, the size of the picture can also be reduced.
4K with 120p
One focus of the camera is video recording. Unlike Canon with the EOS R5, Sony does not use 8K for video, but continues to use 4K, which is said to achieve the best results so far with an alpha camera. The sensor’s 12 MP resolution enables a full-pixel readout without pixel binning and without crop up to 4K / 60p. In this setting, the recording limit should be one hour without overheating – the EOS R5 only manages 30 minutes at 4K / 60p. The video recording of the Alpha 7S III in 4K / 120p mode is limited to this length
The monitor can be swiveled, and the handle and controls have become larger, as with other cameras of the third Alpha generation.
With Full HD, the Alpha 7S III even records at up to 240p. For time-lapse recordings, lower frame rates up to 1p can also be selected in S&Q mode. It is recorded internally with a color subsampling of 4: 2: 2 and a color depth of 10 bits. New codecs are available: XAVC-S-I records single images (All-I) with a data rate of up to 500 Mbits / s, XAVC-HS reduces the amount of data in image group compression to 200 Mbit / s thanks to H.265 compression. With HDMI 2.1, the camera can even output 4K / 60p as 16-bit raw files (ProRes Raw) to an Atomos recorder. Of course there is also a logarithmic gamma profile available (S-Log 2/3), which should enable a dynamic range of over 15 f-stops; the sensitivity starts here at ISO 640 (extended: ISO 160). According to Sony, the rolling shutter effect has been significantly minimized. The Alpha 7S III is equipped with a 5-axis image stabilizer in the housing, which, measured according to the CIPA standard, achieves an effectiveness of 5.5 f-stops; In video mode, digital stabilization (active mode) is also used, which also uses a gyro sensor. The information from this gyro sensor can also be stored in the metadata of the videos so that it can be used in post-processing for digital stabilization.
Fast autofocus and 10 frames/s
The hybrid autofocus covers 92% of the image sensor and uses 759 phase detection points and 425 with contrast AF. In addition to human, the AF algorithms now also recognize animal eyes – according to Sony, also at a greater distance than before. The AF sensitivity goes down to -6 EV series, the camera shoots at up to 10 frames / s. The mechanical shutter is designed for 1/8000 s.

Sony is using two memory card drives in the Alpha 7S III for the first time, which can use both SD cards (UHS-II) and the new CFexpress type A cards. They are smaller than Type B cards and faster than SD cards. For most video modes, SD cards of video classes V60 and V90 are sufficient; CFexpress is only required in S&Q mode with 4: 2: 2 color subsampling and 10 bit color depth. The series mode also benefits from the faster cards; 1000 uncompressed raws in a row should be possible here. Sony plans to launch two CFexpress Type A cards on the market in September, which have a write speed of 700 MB / s and a read speed of 800 MB / s: The 80 GB version is said to be 230 euros, the 160 GB version 440 Cost euros and supplies electricity for 600 photos or 95 minutes of video.

In light of recent offerings I think that qualifies as “exceeds expectations”...
I’m excited by it. And will buy.

So looks like they did something different on the front. Tally light? A new ToF sensor?

Left side looks like what is on the A7Riv (below). New white thing on the right.

🤦‍♂️lots of dopes there. I feel sorry for them.

I have two propositions for their new logo.. 😎
 

It's the recovery times that are the real kicker. Even if they'd added somewhere with metal attached to the heatsinks to get some cooling between takes (maybe where the LCD goes) it would have been better rather than just insulating plastic everywhere.
I bet the internal cooling is sub-par too. You see it all the time with audio/computing gear. Cheap-ass thermal paste applied by a gorilla with a plastering trowel!