The Sigma DP2 Quattro features 29MP Foveon X3 Quattro CMOS Image Sensor and TRUE III Image Processing Engine on the other hand Sony Cyber-shot DSC-RX1R features 24.3MP Full-Frame Exmor CMOS Sensor and BIONZ Image Processor, take a look at the Major Specification Below.
Sigma DP2 Quattro vs. Sony Cyber-shot DSC-RX1R Specification Comparison Table.
Megapixel: With Sigma DP2 Quattro you get more megapixels, don’t fall in Megapixel Marketing Myth because more megapixel DONOT increase image quality, but more megapixels will help you to get large printouts and also help you to re-compose your images after shooting a scene /subject.
Bigger Sensor Size: Sony Cyber-shot DSC-RX1R have bit bigger sensor than Sigma DP2 Quattro. The large sensor captures more light hence the result is lower apparent noise, more color depth in image and increased dynamic range. Hence you will get better image quality with Sony Cyber-shot DSC-RX1R when compared to Sigma DP2 Quattro.
Low pass filter: Sony Cyber-shot DSC-RX1R have no built-in low pass filter, so you get super Sharpe images even when viewed at 100% without moiré or aliasing problem, on the other Sigma DP2 Quattro does have built-in low pass filter, hence Sony Cyber-shot DSC-RX1R better compared to Sigma DP2 Quattro.
Aperture Range: Sony Cyber-shot DSC-RX1R aperture Range is better than Sigma DP2 Quattro, the bright aperture lenses capture more incoming light to the sensor, create more DOF, better color and contrast reproduction and it also create less noise during low-light situation.
Macro: Sony Cyber-shot DSC-RX1R have more close-up macro range than Sigma DP2 Quattro.
More AF Points: Sony Cyber-shot DSC-RX1R have More AF points Compared to Sigma DP2 Quattro, More sensor points simply give the camera more information to process, the Sony Cyber-shot DSC-RX1R can quickly and accurately do AF Compared to Sigma DP2 Quattro.
ISO: The ISO range of Sony Cyber-shot DSC-RX1R is more than Sigma DP2 Quattro, high sensitivity sensor have more ISO range and hence the you get cleaner low-light images.
Better Shutter Range: Sony Cyber-shot DSC-RX1R features better shutter range compared to Sigma DP2 Quattro.
Better Video Mode: Sony Cyber-shot DSC-RX1R Supports Full HD Video capture mode @ 60fps frame rate, but no video recoding options available in Sigma DP2 Quattro.
Wireless: Sony Cyber-shot DSC-RX1R have Eye-Fi Connected and other hand Sigma DP2 Quattro have No Wi-Fi available.
Dimensions: Sony Cyber-shot DSC-RX1R is smaller than Sigma DP2 Quattro.
Weight: Sigma DP2 Quattro lighter than Sony Cyber-shot DSC-RX1R.
High ISO Test Between Sigma DP2 Quattro vs. Sony Cyber-shot DSC-RX1R
Verdict: Based on specification comparison review we highly recommend you to buy the Sony RX1 R camera, since the camera features a fullframe sensor inside it and will give you far better image quality the Sigma DP2 Quattro (specially in low-light situation), the RX1R also features ability to record Full HD videos … based on overall specification and size we highly recommend you to buy the RX1R camera.