As I recall Canon with the SX50, very small sensor, bridge camera, did a great job jumping 1200mm lens shot to 2400mm crop zoom. Stokes, a pro bird photographer used this technique well. An early CIZ?
"http://stokesbirdingblog.blogspot.com/2013/02/canon-sx-50-hs-for-bird-photography-i.html

a6k you commented: "Detroit area but not inside the air pollution bubble/dome." I recall in the 1965 era driving to Detroit from Lansing, there was a SiFi futeristic dome over the city from all the industrial pollution.

These 4 pics were shot on full auto so that the CIZ would work. Two were with my a6500 and FE 70-200 F4 and two with my RX10m4.

These are all SOOC JPG's, of course. I used the "quality" setting that gives the largest JPG in all cases. The distance is about 400'. The time was after 10 am and before noon, sky somewhat clear, Detroit area but not inside the air pollution bubble/dome. The a6500 shots were actually about an hour later.

One RX10m4 shot was at 600 mm equivalent and the other is full-on CIZ so 1200 mm. The exposure is nearly perfect if you consider that the brightest white on the railing is just a hair under 250 on my Mac's Digital Color Meter. The white cover on the porch awning is 255,255,255 on that meter.

The other two shots were the a6500 FE70-200 at 200 mm physically which is equivalent to 300 mm and with CIZ to show equivalent 600 mm. It's a manual zoom lens. The camera has a user-setting to invoke the CIZ and the "hat switch" is used to move from 1X to 2X continuously variable. This is not anywhere near as easy as with the RX10m4.

Now all you pixel peepers and download zealots should have something to work with. As most of you know, the RX10m4 sensor is a "one inch" size and the a6500 is a 1.5x crop frame.

Both shots include normal architecture as well as a bit of nature's shapes. The sky conditions between pairs changed a little.

The EXIF's will give the details but if you can't read them let me know and I will respond with screen captures of them.

A note of observation: Each pair has smaller file sizes for the CIZ version. But since the 2X zoom would be expected to include only 25% of the image area the logical explanation is that Sony is doing a lot of very interesting stuff with CIZ. The EXIF says the pixel dimensions of the shot are the same with and without CIZ. Sony is filling in the spaces, I guess.

I measured a distance on the images on one pair with and without CIZ and as I expected, the linear dimension on the CIZ version was about 0.5X. That means the CIZ image area is .25X. I also measured an object on the CIZ version of the a6500 (600 mm) and the non-CIZ version of the RX10m4 (600) and the sizes were almost exactly the same. So in this case, 600=600.