The Sony Cyber-shot DSC-RX100 is one of the best compact digital cameras ever made. Its large 20-megapixel sensor captures very sharp images even at high ISO settings and in low-light situations, aided by the camera's fast f/1.8 lens. Its autofocus system performs very quickly, it has a full range of manual controls, and can shoot full HD video at up to 50 frames per second. However, at $649, the RX100 is more expensive than some DSLRs and interchangeable-lens compacts, and almost double the price of the Canon PowerShot S100. If you're looking for the best compact camera available, and aren't put off by its price, get the RX100. Otherwise, the PowerShot S100 remains a great option, and is a bargain by comparison.