20.2mp full frame sensor with ISO 100-25600 standard, 50-102800 expanded and ISO noise is about 1 stop better than the 16mp
Olympus OM-D E-M1 of around the same era, but less dynamic range
shutter speed range only 30sec - 1/4000th sec which might be a show stopper for some
“drip” splash and dust resistant body although top plate is plastic and less solid feel than the other full frame models
similar viewfinder to the 5DIII with 21mm eyepoint
DIGIC 5+ image processor as with the 5D III and 1D X
4.5fps burst to 15 RAW frames then drops to 1.4fps (8 RAW + jpeg dropping to 1.1fps)
electronic silent shutter mode but burst reduced to 3fps
only 11 point AF system instead of 61 points
very limited area covered - just the centre
only the center point is cross-type and sensitive to -3 EV
doesn't offer any expanded coverage as did the 9-point system on the EOS 5D Mark II
no EOS iTR (Intelligent Tracking and Recognition), so it can't recognize subjects based on face and color as can the 1D X
63 zone iFCL dual layer metering system only sees warm vs cool tones as with 5DIII
flash sync a very average 1/180th sec which might be a show stopper for some, but it is compatible with WiFi TTL flash and the ST-E3-RT
no AF illuminator nor built-in flash
LCD overlay on the focusing screen to show grid-lines but you can change focus screens for this such as:
fixed non-touch 1040K dot LCD
only one SD card slot, no CF card slot!
Built-in Wi-Fi and GPS
electronic level is only on one axis
mirror lockup now easier to access via menu
6 WB presets
Live View settings and functionality is dodgy and very limited, but face detect AF for static face seems to work OK, although you don't get the closest eye AF as with Olympus cameras, and you can toggle exposure simulation on and off via the live view menu for studio flash use
in-camera HDR and Multiple Exposure modes, but implements these as JPEG only options not as RAW
no on-chip phase-detection to aid autofocus in live view or movie mode
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basic 1080p25/30 video recording but does have Auto and Manual audio recording level control
exposure compensation ±5 (at 1/3 EV, 1/2 EV steps)
lens aberration corrections for vignetting and CA
can set slowest shutter speed for auto ISO settings
No way to reset file number prefix
only USB 2.0
N3 type remote control
monaural mic but does have a stereo headphone socket
HDMI
770g
145 x 111 x 71 mm (5.7 x 4.4 x 2.8“)
same 7.2V, 1800mAh LP-E6 battery as the 5D Mark III
$US2099 RRP when released in 2016, ~$A1900
optional BG-E13 battery grip