Hi, I have a 2009 iMac 27 inches and the picture quality is amazing, the distance between the screen and my head must be about 3 feet. If makes a retina display IMac, would it really be that different? I don't plan on upgrading my iMac ( just ordered a new cmbp) but I am curious what you people here think. My son has an iPad 2 and I have an iPad retina display and I can honestly say that even tho there is a difference, it is not by that much. Would the iMac be any different?