This post can help you to perceive if you really need IBIS or if you can live without it:

https://www.personal-view.com/talks/discussion/comment/244938#Comment_244938

Yes... and now I can use (or approve the use) the GH5s along with Red or Alexa cameras for shoots.

And again, like mentioned above... I don't always have access to a Red or Alexa (or don't always want one)... and if I'm doing a personal music video project or something... I LOVE having a smaller camera like the GH5 with a high-quality codec. Now it's even better that I don't have to deal with the IBIS messing up on gimbals, drones, or my steady cam.

Plus, the GH5 still exists and is cheaper... so what exactly is anti-IBIS angst coming from? Just use the GH5. The GH5s is for specific shooters.

Exactly

"posers" or "people who are maybe shooting something different than what you're shooting." One of the two.

And people who have needs that are not IBIS are also "people who are maybe shooting something different than what you're shooting."

Not to be cynical, but the numbers don't suggest that Panasonic is catering to professionals. Real professionals account for a tiny fraction of sales.

So by that logic Panasonic shouldn't make say an EVA1 or Varicam because the sales would just be a tiny fraction of a Panasonic G80??

The fact is, by removing the IBIS they are selling a camera that is cheaper to make

That only can be a more than big enough reason to justify the removable of IBIS.

The GH5S is already the most expensive MFT camera ever, what if including IBIS (if it is even technically possible in the GH5S) meant the total price is then over $3K?? Imagine how well that would have gone down!

The whining and complaining over the price would be nothing next to the complaints that high price would generate.

@DrDave "In fact, real professionals are often using high end cams with these as B cams"

Yes... and now I can use (or approve the use) the GH5s along with Red or Alexa cameras for shoots.

And again, like mentioned above... I don't always have access to a Red or Alexa (or don't always want one)... and if I'm doing a personal music video project or something... I LOVE having a smaller camera like the GH5 with a high-quality codec. Now it's even better that I don't have to deal with the IBIS messing up on gimbals, drones, or my steady cam.

Plus, the GH5 still exists and is cheaper... so what exactly is anti-IBIS angst coming from? Just use the GH5. The GH5s is for specific shooters.

@Scot "It's just a simple fact that IBIS is very useful especially to the level of client buying these cameras. If they perceived it as such a problem they should have invented a way to lock down the sensor."

No, they've said that they wanted the larger sensor in the GH5s... there isn't any room for the IBIS hardware regardless of locking it down or not... and I'd definitely rather have the former (larger sensor) than the latter. It's a different style of GH5... it's not for bloggers and random videos. It's more cinematographer/production orientated. IBIS is still too gimmicky and unreliable in certain situations like @GeoffreyKenner mentioned above.

If you're using any kind of gimbal, steady-cam, drone... ect... you're not going to want the IBIS.

It's just a simple fact that IBIS is very useful especially to the level of client buying these cameras. If they perceived it as such a problem they should have invented a way to lock down the sensor. I can't believe that it can't be done. That being said I never heard anyone say "that damn IBIS is screwing me up wish they would remove it". So there justification just comes off as excuses. Also if your going to go this route you need to make remote focusing work as good or better than Canon especially when your AFC is below par. This way you can still use lite gimbals with these small cameras instead of big heavy Gimbals with motorized follow focus defeating the advantage of the small camera.

"posers" or "people who are maybe shooting something different than what you're shooting." One of the two.

That last test shows the better Face detect AF but hunting still prevails. See the erratic breathing of the focus on the background. Still a marked improvement from the terrible GH5 performance here.

http://www.imaging-resource.com/news/2018/01/17/review-redo-sony-a7s-ii-vs-panasonic-gh5s-high-iso-comparison

@soulkeeper

1. In all modes, Dual Native iso is 400 and 2500 in all picture profile modes. What changes is the base iso depending on which profile you're using. Here is what I have been told:
   Log or HLG low range is 320-1600, high range is 1600-25600, HLG can use extended high ISO
   with other profiles no range is 160-800 and high range is 800-51200
   Shooting under the native Dual ISOs comes with reduced Dynamic range, but results in cleaner footage at a loss of highlight detail.
2. ETC the 1080 looks to be a double crop of the full view, I don't believe 4K has any etc mode due to the multi aspect sensor. It didn't seem to be offered in any of the modes I tried.
3. Could you please private message me regarding the high contract scene and I will try and capture something for you specifically.

I have to give the camera back to Panasonic tomorrow unfortunately as it is going to be used on an upcoming TV show!

http://jacobjamesphotography.co.uk/417-panasonic-lumix-gh5s-review/