The 61MP sensor of the new A7r IV is a first for the A7 series, and for full-frame cameras in general. Despite the impressive number of pixels the camera has to deal with, it maintains excellent speed capabilities that are only too familiar to A7 users.

But if we have to talk about speed, we can’t ignore the A9. The flagship has set a benchmark that has not yet been challenged in the full frame segment.
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https://mirrorlesscomparison.com/preview/sony-a7r-iv-vs-a9/