Not surprisingly, the Mark V looks a whole lot like its predecessors. It continues to use a 1″-type 20.1MP sensor (more on that in a minute) and 24-70mm equiv. F1.8-2.8 lens, and sports the same pop-up viewfinder with 2.36M-dot OLED panel as the RX100 III and IV. The big improvements are all under the hood.
Phase-detection autofocus
The RX100 V’s sensor is of a similar stacked design to the Mark IV’s but gains 315 phase-detection AF points covering 65% of the frame. Combined with a front-end LSI chip, the RX100 V’s AF system is capable of acquiring focus in as little as 0.05 sec.
The main benefit of phase detection elements on the sensor is that they give the camera an understanding of the depth and where your subject exists in the scene. This not only means faster focus but should also allow more reliable subject tracking, since the camera has additional information to help it determine your subject and its location.
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https://www.dpreview.com/news/4462707161/hands-on-with-the-sony-cyber-shot-rx100-v