Did you have to run any manual cleaning cycles on the IPF5000? According to the article:
"There is the ability to manually run a cleaning cycle from the printer's front panel, or from its utility software. But, I am told that the need to do this is very unlikely. The reason being that the design of the iPF5000 is such that it constantly sense all 30,720 individual nozzles, and is able to know when a cleaning cycle is needed. Or, if needs be, the printer can bypass a clogged nozzle in the middle of making a print."
If this is true, every print coming out of the printer should be perfect, with no need to run cleaning cycles manually. This would be a huge advantage for the Canon. Were any of the prints you made marred by clogging and needing to be reprinted?