I just found one nice picture in a Chinese page in which there is one representation of the visual difference between an 8 bit VS 12 bit Oscilloscopes.
What no one says from what ever I have read about all this, is that if one manufacturer likes to jump on this wagon, he have to use a display of some size with resolution 800x600 or higher.
Regarding this picture my GDS2102A haves even better visual quality than this 8 bit sample.
And this fact makes me think that even if one 8 bit scope it is truly well implemented it will satisfy the eye.
http://www.dzsc.com/data/html/2012-8-7/100889.html