Sorry but you are totally wrong on point #1 The 1D4 has an even better feature than you are asking for. You set the minimum to whatever you want and the maximum to 1/8000. So if the iso gets to 100 but that would overexpose then the shutter speed increases approriately. I am sorry that you think that using the function as intended is such a bad thing but it does the job and does in in a failsafe fashion
only applicable in "Av" mode. D800/D4 will do the same, only (theoretical) advantage of the 1D IV is the range of shutter times between 1s and 30s in combination with Auto ISO:
#2 the minimum is setable from 30s to 1/8000 in the 1D4
As far as #3 and #4 are concerned the D800/D4 are way better ... beacuase the 1D IV will not
* automatically set shutter speed to 1/focal length in Av and P in Auto-ISO [#3]
* and allow the user to choose to apply a correction factor to that auto funtion for faster or longer shutter times. [#4]
#3 yes - http://cpn.canon-europe.com/content/education/infobank/camera_settings/shooting_modes.do
If you refer to the "program line" in the link you provided ... this only applies to "P" mode ... and only to time+aperture combinations @ a chosen ISO setting. It is not at all an equivalent of the D800/D4 "ISO Sensitivity" function in Auto-ISO.
But since you state in an earlier post
All these points can be done in the 1D4 (except for #3 as there is no P mode)
you may want to try out the instructions in the Canon-link you provided:
"To set the shooting mode on EOS-1D and 1Ds series cameras press the Mode button (top left) and then turn the electronic input dial. The mode selected (P
, Tv, Av or M) will appear in the top left of the LCD panel."
I find it disappointing that you have decided to have anti Canon/pro Nikon rant. It sounds like you have never used a series 1 Canon and that you have sucumbed to the 'D800 is greatest' brainwashing.
I find it disappointing that even in 2012 Canon is still not able to provide competitive Auto-ISO functionality, especially since all of it simply is a cheap firmeware item.
I find it even more disappointing, that Canon has brought out an inferior, firmware-crippled camera and is charging 20% more for it than Nikon asks for a camera that has way better IQ and bests the 5D3 in practically every other respect, with the sole exception of fps. Heck, as far as IQ is concerned, it is probably even a better crop camera than my 7D.
And I find it disappointing, that any Canon-critical discusion is immediately termed "Anti-Canon rant" around here.