The dithering effect is much less noticeable with the video on youtube. On my high quality video locally, it's very apparent.
MBPR: 15" retina, early 2013 model (MacBookPro10,1), 2.4ghz, 8g 1600mhz ram, running 10.8.3
MBA: 13", 2011 model (MacBookAir 4,2), 1.7ghz, 4g ram, running 10.8.5
Image used: http://vizfact.com/wp-content/uploads...
Macbook pro is on left, macbook air is on right.