Great if your service provider is down the street. No so much if 1400 miles away like mine.
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Always format the card in the Camera. The two formats are not exactly the same, and the camera has to work with the card all day long. Think of it this way, who do you want organizing your mechanic's toolbox, the mechanic, or your accountant?
What is the difference between formatting Fat 32 in one camera versus another? I've swapped cards among most Canon DSLRs for many years with no problems.
As soon as you put a card in the camera and turn it on to reformat the card, the camera has already picked up the higher image number. You must do a long format on the card externally when moving a card from camera to camera if you do not want to pickup the highest image number from the other camera.
Then format it in camera again.
So? 19mp with a 1.3 crop is better than the current 1DIV resolution. Double Digic V would most probably be able to handle this at 10 fps. You get to trade speed for resolution depending of the job to complete.