Sony RX100 IV compact records 4K video, uses a stacked sensor

The Sony RX100 series of compacts has gained quite a positive reputation in the somewhat short time it's been around, for squeezing a relatively large sensor into a small compact. The RX100 IV continues that tradition and uses Sony’s next generation sensor, a stacked 20.1MP 1"-type Exmor RS CMOS sensor, coupled with an attached DRAM memory chip for speedy processing.