28.7 x 19.1mm CMOS sensor with 16.1 million pixels (1.3x)
Pixel size 5.7 microns
10 frames per second 26 shot burst for RAW
Firmware version 1.1.3
Marketed December 2009
Bought used on eBay on 11/7/2011.
I estimate that the shutter had around 30,000 actuations when I received it.
Shutter count was 45,246 on 3/3/2012 using EOSCount on Internet Explorer
Canon EOS-1D Mark IV shutter count is: 143,685 on 5/31/2013.