Yes, I'm sure that camera will be fine, the 20D some years back was considered OK for wedding images
BUT its more about the quality of the LENS you are using and will it wok in all situations
I used to do a lot of Film work for weddings and used various canon camera bodies, but the lenses where the important factor for speed, composition - I also used a top quality flash unit, that could be used OFF camera.
I used a 28mm lens, 50mm 1.8 lens - very high quality and cheaply available, 135mm portrait lens, and various zoom lens
I also always used a tripod, so i could compose the groups and then leave, the camera and go and work with setting up the group, and using a remote take the picture.
I also used a flash frame on the flash, so I could turn the camera between portrait and landscape with out worrying about the flash gun
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