Main
Model
Price
Advantages
launch
Announced
Body type
Camera subcategory
Sensor
Effective pixels
Max resolution
Sensor size
Sensor type
Processor
Image ratio w:h
Other resolutions
Sensor photo detectors
Image
ISO
Boosted ISO (minimum)
Boosted ISO (maximum)
White balance presets
Custom white balance
Image stabilization
Uncompressed format
JPEG quality levels
Photography features
Minimum shutter speed
Maximum shutter speed
Aperture priority
Shutter priority
Manual exposure mode
Subject / scene modes
Built-in flash
Flash range
External flash
Flash modes
Continuous drive
Self-timer
Metering modes
Exposure compensation
AE Bracketing
WB Bracketing
Screen / viewfinder
Articulated LCD
Screen size
Screen dots
Touch screen
Screen type
Live view
Viewfinder type
Viewfinder coverage
Viewfinder magnification
Viewfinder resolution
Videography features
Resolutions
File Format
Videography notes
Microphone
Speaker
Optics & Focus
Autofocus
Manual focus
Number of focus points
Lens mount
Focal length multiplier
Digital zoom
Physical
Weight (inc. batteries)
Dimensions
Environmentally sealed
Battery
Battery details
Battery Life (CIPA)
Storage
Storage types
Connectivity
USB
HDMI
Wireless
Wireless notes
Remote control
Microphone port
Headphone port
Other features
GPS
GPS notes
Orientation sensor
Timelapse recording
Samples
Videos
Summary
The Nikon D810 offers more number of focus points than the Alpha 7R: 51 vs 25. More number of focus points means less risk of losing focus lock during tracking a moving object.
The Sony Alpha 7R is equipped with tilting display which will allow the photographer to take high quality selfie photos. The Alpha 7R display is better as it has more number of screen dots 1,230,000 in comparison to 1,229,000 dots of the Nikon D810 display. The higher dot count display is better for reviewing photos on your camera.
The Nikon D810 is produced with built-in flash. The Sony Alpha 7R has built-in Wi-Fi which will help the photographer to transfer pictures wirelessly from a camera to a computer. The Nikon D810 battery life is better in compare to the Alpha 7R battery life. In accordance with CIPA standards the camera owner will be able to produce 1200 shots with the D810 and only 340 with the Alpha 7R. The Sony Alpha 7R weighs 465g which is 515g lighter in comparison with the weight of the D810. The D810 can utilize optional accessory GPS devices. This feature can be convenient if you like to travel, to be able to go into the picture metadata and see exactly where a photo was captured.
Taking into account the above-mentioned differences the Nikon D810 will be the best choice. Check the lowest price on Amazon.