I was going to post a reply towards all the details and direct usage of others but forgot to do it.
Here is a demo video between the 44" Canon Pro series and 44" Epson P series. Note that this is for demo purposes only per the users note at the beginning, but provides valid information.
https://www.youtube.com/watch?v=5p25vhclF4YOf course speed and ink usage may be slightly less for the 24" models since it will slow down a little on larger versions with the extra space to work with and you can print wider (of course). Ink usage between 17" and 24/44" will be different for sure since the smaller model only offers a specific size ink while the larger ones will have 3 sizes available (which depends on color usage to go with larger inks for better savings).
And remember, each user of one of the printers will have different details since not every printer will act exactly the same since it depends on environment, light specs, etc. The users suggestions and what not help others for sure, but as I mentioned before, this really would depend on what you're printing and the possible settings. Our company gets the details from customers this way to help determine which model we would recommend for them before they purchase. They both have their cons and pros which is helpful though.
The Pro-1000 may be more "gas" guzzling than the Epson for some, but others may not feel that issue. We have the Pro-1000 and have been on low ink status for most of our colors for a few weeks and still printing. We currently have the Pro-1000, Pro-4000, Epson P800, P5000 and P7000CE in our office that we use weekly and for demos. They may not be as crazy as other users may experience (which is surely possible), but suggestions to others help for their decision.