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Main
Model
Price
Advantages
SENSOR Max resolution: 6016 x 4000
IMAGE ISO: Auto, 100-819200
PHOTOGRAPHY FEATURES Built-in flash: Yes
SCREEN / VIEWFINDER Viewfinder type: Optical (pentaprism)
OTHER FEATURES GPS: Optional
Main
Model
Price
Advantages
SENSOR Sensor size: Full frame (35.6 x 23.8 mm)
SENSOR Sensor photo detectors: 28 megapixels
IMAGE White balance presets: 10
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/8000 sec
PHOTOGRAPHY FEATURES Continuous drive: 20.0 fps
SCREEN / VIEWFINDER Screen dots: 1,440,000
OPTICS & FOCUS Number of focus points: 693
PHYSICAL Weight (inc. batteries): 673 g (1.48 lb / 23.74 oz)
PHYSICAL Battery Life (CIPA): 650
CONNECTIVITY HDMI: Yes (micro-HDMI)
Summary
The KP highest resolution of 6016 x 4000 pixels (24 megapixels) is better in comparison with the Alpha a9 maximum resolution of 6000 x 4000 pixels (24 megapixels). The Alpha a9 is produced with bigger sensor than the KP: Full frame (35.6 x 23.8 mm) versus APS-C (23.5 x 15.6 mm). It is very significant advantage of this model because large sensor allows you to make photos of the more professional quality. The KP offers a wider ISO range of 100-819200 than 100-51200 ISO range of the Alpha a9. Such ISO numbers allow you to make good quality photos in dim light situations. The Alpha a9 has more number of white balance presets - 10. This option gives you more control over colour. The Alpha a9 offers more number of focus points than the KP: 693 vs 27. More focus points means less risk of losing focus lock during tracking a moving subject.
The Alpha a9 screen is better as it has more number of screen dots 1,440,000 in compare to 921,000 dots of the KP display. The higher dot count screen is better for reviewing pictures on your camera.
The KP is produced with built-in flash. The Alpha a9 battery life is better in compare to the KP battery life. According to CIPA standards the camera owner will be able to produce 650 photos with the Alpha a9 and only 390 with the KP. The Sony Alpha a9 weighs 673g that is 30g lighter in comparison with the weight of the KP. The KP can utilize optional accessory GPS devices. This feature can be useful if the camera owner is a traveller, to be able to check the photo metadata and find out exactly where a picture was captured.
Considering the above differences the Sony Alpha a9 becomes the best choice. Check the list of the best offers on Amazon