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
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
Storage included
Connectivity
USB
HDMI
Wireless
Wireless notes
Remote control
Other features
GPS
GPS notes
Orientation sensor
Timelapse recording
Samples
Videos
Summary
The D810 maximum resolution of 7360 x 4912 pixels (36 megapixels) is better in comparison with the D4 highest resolution of 4928 x 3280 pixels (16 megapixels).
The D810 screen is better as it has more number of screen dots 1,229,000 in compare to 921,000 dots of the D4 screen. The higher dot count screen is better for reviewing pictures on your camera.
The D810 is produced with built-in flash. The Nikon D810 weighs 980g that is 360g less in comparison with the weight of the Nikon D4.
Taking into account the above differences the D810 becomes the best choice. Check the list of the best offers on Amazon.