Sony has, rather quietly, released updated versions of its a7R III and a7R IV cameras that bring small improvements to the full-frame mirrorless cameras. The updated cameras now have an ‘a’ appended to their model numbers to differentiate them from their original predecessors.

According to the update product specifications, both the a7R III (model: ILCE-7RM3A) and a7R IV (model: ILCE-7RM4A) have improved rear LCD panels, up to 2.36 million dots compared to the 1.44 million dots in the original models. 
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