For those of you who has a retina MBP, please look closely at both bottom corners of Safari, and left bottom corner of iMessage, those corners are NOT SMOOTH. Obviously Apple forgot to optimize them for retina screen. Here I have attached two photos of comparison of Safari, iMessage and Finder. Interestingly, the right bottom corner of iMessage looks good. Is there any way to notify Apple about this thing? It makes me very upset since I find it... I shouldn't have looked closely at the corners!