Anybody that wants to argue the point really needs to read my two links, and get a background understanding on the CoC, circle of confusion.
The first thing you have to do when trying to understand this dof stuff is set a standard for your comparison. If we are going to assume a same sized reproduction, ie 8"x10" print or "fill screen" on the same monitor, and frame the image the same while shooting from the same place, you have to take everything into consideration.
Here is a comparison I did a while ago for another thread much like this one. It is a comparison based on the above criteria. The three images are identical in dof, noise, perspective, angle of view, etc etc.
If you read and understand the quote from Wikipedia I posted you will understand if you change your comparison criteria you will change the dof characteristics.