Here is a quick comparison for the Sony A7R III vs Nikon D850 vs Sony A99 II high-end cameras with full-frame image sensors.

Sony A7R III mirrorless camera can shoot full frame 42MP RAW photos at a blazing speed of 10 frames per second with full AF and AE capabilities. Everything you need to know about the Sony A7R III, including photos, video, specs and release date can be found here.

On the other hand the Nikon D850 is a professional-grade full-frame DSLR which boasts of a 45.7-megapixel sensor and 4K video recording support.

Sony A99II features a 42.4-megapixel full-frame CMOS sensor. The sensor allows for 12 fps burst shooting with continuous AF/AE and a top ISO of 102,400. The image processor offers 4K video recording and a 5-axis in-body image stabilization mechanism.
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