Below are crops from our laboratory Still Life target comparing the Sony A7R Mark IV’s JPEG image quality to its predecessor, the A7R Mark III. We’ve also compared the A7R IV to a couple of high-resolution cameras from Canon and Nikon, namely the Canon 5DS R and Nikon Z7, as well as to Fuji’s GFX 50S and the Panasonic S1R.
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https://www.imaging-resource.com/PRODS/sony-a7r-iv/sony-a7r-iv-image-quality.htm#image-quality
