The Sony a7RIII has grown up a lot over the Sony a7RII and the first photographers to receive them are mainly pointing out the differences between the original and new camera. Sony did a good job of listening to the needs of professionals, but I really wonder if some of the things that were addressed could have been fixed via firmware update. Of course, issues like battery life required a hardware revision, but if Sony waits another 3 years to refresh the Sony a7R then they might find themselves quite a bit behind other camera manufactures by then.
The Nikon D850 is very close to the Sony a7RIII and Nikon could refresh the camera quickly or even improve it via a firmware update. Plus Fujifilm, Panasonic, and Olympus are all doing very interesting things with their camera lineups this generation and Canon could always shock us. Hopefully, Sony continues improving this generation of cameras via firmware updates like other brands have. So far Sony seems to be listing to what professional want.
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Sony a7RIII: B&H Photo / Amazon / Adorama
Sony 24-105mm: B&H Photo / Amazon / Adorama