It will be hard to compare with some of these but I have to relay a recent experience.
After working for close to a month on site redesigns for my office the design group was called into the CEO's office (a very hard man to please). After telling us of all the things which made the site "unprofessional" he proceeded to point out things he felt were glaring errors.
At this point I recognize he's viewing our latest image (.jpg) mock-up at 1200%.
When we tried to explain how what he's viewing isn't an appropriate gauge for what the work will look like published online he quickly barked out:
"I don't want to know about all that coding."