36mp full frame pro dSLR
only 5fps burst mode (only 4fps in D800) but can get 7fps in DX mode with battery grip and batteries
no anti-alias filter (OLPF)
base ISO has been lowered while max. ISO has been raised, becoming the 1st camera to give a range of ISO of 32-51,200
built-in flash
shutter 30sec - 1/8000th sec, x-sync 1/250th sec
25% faster operation
slightly improved AF
HD video improved:
to 1080/60p - only 30p in D800
zebra strips for focus checking
uncompressed HDMI output with simultaneous recording to memory card
built-in stereo microphone (only mono in D800)
power aperture available while shooting video to SD/CF card (compared to only when using HDMI in the D800)
ability to record to memory card while simultaneously outputting video over HDMI
new 'flat' Picture Control mode (intended for videographers who need broader dynamic range)
electronic first curtain shutter to reduce vibration
redesigned mirror mechanism to reduce vibration
new 'RAW Size S' 9MP Raw mode
Expeed 4 processor
3.2in 1,229k-dot RGBW LCD screen (only 921K in D800)
improved Scene Recognition System allows face detection in OVF mode
auto ISO available in manual exposure mode
USB 3.0
optional WiFi
EN-EL15 lithium-ion battery
980 g (2.16 lb / 34.57 oz)
146 x 123 x 82 mm (5.75 x 4.84 x 3.23″)
optional GPS via GP-1 or GP-1A