DXO compared the Sony RX100 V vs IV and unsurprisingly the sensors are practically identical. The main difference between the two cameras is autofocus and burst capabilities, which are impressive.
The upgrades to Sony’s RX100 V autofocus and burst shooting frame rate are welcome improvements for photographers after a high-performance compact. Its incredible 24fps frame rate with full autofocus and exposure tracking, not to mention its ability to capture up to 150 RAW and JPEG files, is some impressive high-speed shooting, and the new 315-point autofocus should improve focus tracking, too. Image quality hasn’t improved over the Mark IV, but it’s still very good for a compact camera. If you can shoot outdoors or in good lighting conditions at low ISO sensitivities, both color and dynamic range are excellent, and noise is respectable up to ISO 800. If high-quality low-light photography is important, however, the higher levels of noise above ISO 800 might be disappointing and may require some smoothing in post-production for better results.
Read the full review at DXO