DXOMark just published their review of the sensor inside the Sony a9II and Sony ever so slightly tweaked the sensor form the original Sony a9. You can read the full review here or you can see part of the conclusion below:
Sony says that the a9 II has the same sensor as the original a9, but as we’ve seen the new model adopts a different approach to processing, using a change in sensitivity behavior both to improve color discrimination and to widen dynamic range at higher ISOs. It’s the first time we’ve seen this and it marks a shift in strategy for Sony.
The Sony a9 II is certainly a niche camera, built to compete alongside the Canon EOS-1 DX Mark II and Nikon D5. However, while it’s unlikely that individual photographers or agencies would switch from those rival cameras, bearing in mind their investment in lenses, the Sony a9 II’s high sensor performance and lower price would be tempting for newcomers thinking of entering the competitive field of sports journalism.
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Sony a9II: B&H Photo / Amazon / Adorama
Sony a9: B&H Photo / Amazon / Adorama