The Sony a7R III, Sony a7 III, and Nikon D850 have been making waves this year and are in the conversation for best camera you can buy right now.
Shootout: Sony a7R III vs Sony a7 III vs Nikon D850
Sony a7R III Full-Frame Mirrorless Camera
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Comparison sony a7rv vs nikon d850
Sony a7R III ties Nikon D850 and scores 100 on DxOMark test
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Imaging Performance compared : Nikon D850 vs. Sony A7R III: Speedy full-frame titans compared
Sony Fullframe Comparison: Sony a7 III -vs- a7 II, a7R II, a7R III & a9
The Nikon D850 vs the Sony A7R III for Underwater Photography - Underwater Photography Guide
Sony A7 III first impressions - what is going on with metering in video? - - Filmmaking Gear and Camera Reviews
Nikon D850 vs Sony Alpha 7R III: What is the difference?