Canon Digital Rebel XT Gamut
For grins, Dry Creek Photo also has gamut information on the sensors in Canon cameras. They don’t have the 5D, but they do have the 1Ds Mark II and the Canon 20D. The Canon 20D is the same sensor as the digital rebel and running this shows that it is a good match for Adobe RGB, although it has some colors that Adobe RGB can’t display. That’s one reason to produce output in RAW format. Then you can use a convertor that uses ProPhoto for instance to capture everything the sensor does since cameras typically only write JPEGs in Adobe RGB space.
_As another aside, the default rotation in Octaga is way too high, you need to right click and choose Navigation/Speed and slow the Rotation Speed from 1.0 to something more like 0.3_