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Verdict
If Nikon thought it was going to have things all its own way with the D850, it should think again. Sony has taken one of our favorite mirrorless cameras and bolstered the performance to make the new Alpha A7R III a much more capable and well-rounded offering.
As we've seen with the D850, you no longer have to sacrifice performance for resolution or vice versa. The heady mix of 42.2MP and high performance that includes 10fps burst shooting and a very sophisticated AF system is bound to help this camera appeal to an even broader range of photographers than the older model. This is a camera that would be equally at home perched on a mountain as in a studio or on the sidelines of a football match.
For now, the Alpha A7R III is not only the most well-rounded mirrorless camera you can buy, but one of the best cameras out there.
Competition
Nikon D850
The closest rival to the Alpha A7R III, Nikon's D850 is a fabulous full-frame DSLR that delivers stunning 45.4MP images, and combines a wealth of features with top-notch performance.
Read our in-depth Nikon D850 review
Sony Alpha A7R II
It may have been superseded by the mark III, but the A7R II is still a great camera that delivers excellent images. If you're not too concerned about blistering performance, this is still a good buy.
Read our in-depth Sony Alpha A7R II review
Phil Hall is an experienced writer and editor having worked on some of the largest photography magazines in the UK, and now edit the photography channel of TechRadar, the UK's biggest tech website and one of the largest in the world. He has also worked on numerous commercial projects, including working with manufacturers like Nikon and Fujifilm on bespoke printed and online camera guides, as well as writing technique blogs and copy for the John Lewis Technology guide.
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