Another picture from a Sony ILCE-7RM2 camera appeared on flickr. The maximum resolution is 9440 x 6300. Last week a picture with a similar resolution was publish by Zeiss. Those images could be upscaled, but as you can see from the screenshot above, somebody was able to find the following string in the jpg file:
Adobe
Exif
SONY
ILCE-7RM2
Adobe Photoshop CC 2014 (Macintosh)
2015:05:05 21:36:48
Update: download the full res file and open it with a good text editor, the "Sony ILCE-7RM2" string is right at the beginning:
