Here is a quick comparison of the Sony RX100III vs RX100IV vs RX100V premium digital cameras.

The new Sony RX100 V maintains a 20.1-megapixel 1-inch Exmor RS BSI CMOS sensor and 24-70mm equiv. F1.8-2.8 lens from the IV.

On the other hand the camera adds phase-detection AF to achieve focus speeds as fast as 0.05 sec.

The Sony RX10 III bridge camera uses the same 1-inch 20.1-million-pixel stacked sensor as well as 4K/UHD video. The dust and moisture resistant camera offers an XGA OLED EVF with 2.36 million dots, as well as a tilting LCD.
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http://www.dailycameranews.com/2016/11/sony-rx100-iii-vs-rx100-iv-vs-rx100-v/