The larger the sensor the more light the sensor captures yielding in better image quality.
36 x 23.9mm
Polaroid Snap: 81.2 x 25.4mm
35.9 x 24mm
3. focus points
The more focus points the more flexibility in picking which part of the scene to focus on. They also give the image sensor a better probability in identifying the right area of the scene to focus on in more automatic modes.
Sony Alpha a7 III: 693
4. continuous shooting at high resolution
Fast continuous shooting is useful for catching action shots.
Olympus OM-D E-M1 Mark II: 60fps
The maximum ISO at which the device still captures excellent quality images. Source: DxOMark.
Sony Alpha 7S: 3702ISO
6. maximum light sensitivity
With a higher light sensitivity (ISO level), the sensor absorbs more light. This can be used to capture moving objects using a fast shutter speed, or to take images in low light without using a flash.
Nikon D7500 + Nikon AF-S DX Nikkor 18-140mm f/3.5-5.6G ED VR: 1640000 ISO
7. image quality
A device's overall image quality score considers: color depth, dynamic range and low light performance. Source: DxOMark.
Sony Alpha 7R II: 98
8. longer battery life
CIPA is an independent, standard measurement that determines how many shots a camera can take before the battery dies.
Nikon D3x: 4400shots
9. video recording (main camera)
The maximum resolution available for videos shot with the main camera. Although it may be possible to choose among other frame rates, those recordings usually have lower resolutions.
1080 x 30fps
Canon EOS 1D X Mark II: 2160 x 60fps
1080 x 30fps
HTC Re: 65.5g
11. Has WiFi
The device can connect to WiFi.
37% have it
12. color depth
The better a device's color depth the more color nuances it can distinguish. Source: DxOMark.
HP Photosmart R927: 42bits
13. Has phase detection autofocus for videos
A phase detection autofocus system is faster than a contrast detection autofocus system. Even when recording scenes with a lot of fast movements, the videos are sharp and clear.
11% have it
14. has a stereo microphone
A stereo microphone allows to record audio files or movies in stereo without an external microphone.