The 1D MKIV is severely flawed even for 2009; one reason= APS-H sensor. Not to mention any file shot above ISO 1600 is as good trash.
Well I guess you must have had a poor version then if you owned a 1D4?
Technology is not an issue - image IQ is. So the comment about APS-H is hollow and not relevent. In 2009 top IQ was served by the 5D2 amd the 1DS3. No other camera of that time got even close to the 1D4. The 1D4 was also the best IQ in low light at the time - plus of course the advantages of 10fps and all the other 1 series advantages.
Only iso 1600 - please dont make me laugh - trash doesn't start until 12800
Perhaps you mis-read the article that talked about the 7D and iso 1600?