Yes on that note 5D was rated one of the best cameras for Noise in low light too.

I shot a microsoft gig at the convention centre went from 7am to 10pm all day
I used the 5d and 24-70 and 70-200 those rooms were dark so the 2.8 i needed to focus as well. and i needed images to come out good from the camera as i didnt have much time to edit as i was feeding them from lightroom quick edit then up to the plasma screens around the expo .