The Canon T3i/600D got released in 2011, the Canon 80D in 2016. Since I own them both I did a little test on the video quality.
All footage taken in FullHD 25fps, all manual.
Settings on camera:
Sharpness +1
Contrast -1
Saturation 0
Color tone 0
Lenses used:
Sigma 10-20 f/4-5.6
Sigma 17-50 f/2.8
Sigma 30 f/1.4
Canon 70-200 f/4
