http://www.dpreview.com/reviews/sony-cybershot-dsc-rx100-iv

Conclusion - Pros

Some of the best image quality in any compact camera, ever
Impressively sharp 24-70mm equiv lens remains usefully bright throughout zoom range
Impressive image stabilization for stills, dramatically effective in video
Well implemented Eye AF system tracks subjects well
Superb high resolution EVF
5fps shooting with autofocus and large buffer (16fps with locked focus)
Silent (all-electronic) shutter comes at no image quality cost
Clever Auto ISO system gives plenty of control and is directly accessible
High quality 4K (UHD) video with extensive support tools and improved AF options
Clever high frame rate video mode for dramatic slow-mo video
1080/120p video with reduced rolling shutter and fewer shooting restrictions
Excellent, straightforward Wi-Fi implementation (especially if you have NFC)
Picture Profile gives pro-grade control over video output
USB charging is universal and convenient

Conclusion - Cons

Extensive feature set overwhelms the user interface
As a twin-dial camera, could be programmed better to make full use of both dials
Expensive compared to rivals
Short battery life
Lock-on AF can be unpredictable and laggy
Lens range will be limiting for some users
No microphone socket
Awkward feature interactions mean regular 'I can't do that' warning messages
No external charger included for rapid charging or keeping a spare battery topped-up

Overall Conclusion

The RX100 IV continues the line's tradition of packing as much image and video quality into as small a package as possible. 
The RX100 IV is also an incredibly responsive camera; fast and ready to churn out high quality images and video with tools designed to help you achieve your vision. 
The new stacked sensor in the RX100 IV allows for a number of benefits: it supports the ability to read out the image sensor faster, 
which itself enables faster shooting modes with AF due to the fully electronic (silent) shutter. Faster readout and buffering also enables 4K video, high frame rate movies, 
and generally more advanced AF. An impressive, bright lens and an upgraded EVF round-out the package and make this the most capable camera of its kind.