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Main
Model
Price
Advantages
PHOTOGRAPHY FEATURES Built-in flash: Yes
PHOTOGRAPHY FEATURES Continuous drive: 6.5 fps
SCREEN / VIEWFINDER Screen size: 3.2″
SCREEN / VIEWFINDER Screen dots: 1,229,000
PHYSICAL Battery Life (CIPA): 1230
OTHER FEATURES GPS: Optional
Main
Model
Price
Advantages
SENSOR Effective pixels: 42 megapixels
SENSOR Max resolution: 7952 x 5304
SENSOR Sensor photo detectors: 44 megapixels
IMAGE ISO: Auto, 100-25600 (expands to 50-102400)
IMAGE Boosted ISO (maximum): 102400
IMAGE Image stabilization: Sensor-shift
PHOTOGRAPHY FEATURES Maximum shutter speed: 1/8000 sec
VIDEOGRAPHY FEATURES Resolutions: 3840 x 2160 (30p, 25p, 24p), 1920 x 1080 (60p, 60i, 24p), 1440 x 1080 (30p), 640 x 480 (30p)
OPTICS & FOCUS Digital zoom: Yes (4X)
OPTICS & FOCUS Number of focus points: 399
PHYSICAL Weight (inc. batteries): 625 g (1.38 lb / 22.05 oz)
Summary
The Sony Alpha 7R II maximum resolution of 7952 x 5304 pixels (42 megapixels) is better than the D750 highest resolution of 6016 x 4016 pixels (24 megapixels). The Sony Alpha 7R II has a wider ISO range of 100-25600 than 100-12800 ISO range of the D750. This ISO range allow you to make good quality pictures in dim light conditions. The Sony Alpha 7R II provides image stabilization which will help you to make sharp images of non-moving subjects in low light when the camera owner is not using the flash. The Alpha 7R II offers more powerful 4X digital zoom. The Sony Alpha 7R II provides more number of focus points than the D750: 399 vs 51. More number of focus points means more convenience when attempting to focus on subjects which are not centred.
The D750 screen is better as it has more number of screen dots 1,229,000 in comparison to 1,228,800 dots of the Sony Alpha 7R II display. The higher dot count screen is better for reviewing images on your camera.
The D750 is produced with built-in flash. The D750 battery life is better in compare to the Sony Alpha 7R II battery life. In accordance with CIPA standards you will be able to produce 1230 shots with the D750 and only 290 with the Alpha 7R II. The Alpha 7R II weighs 625g which is 125g lighter than the weight of the D750. The D750 can utilize optional accessory GPS devices. Recording GPS data can be convenient if the camera owner is a traveller, to be able to check the image metadata and find out exactly where an image was shot.
Taking into account the above differences the Alpha 7R II is the best choice. Check the list of the best offers on Amazon