You make a claim that this is specifically for Chrome on OS X, yet I don't think you've done enough homework to make such a broad statement. I am using Chrome 23.0.1271.101 on OS X 10.8 no a retina MBP, and fonts looks beautiful across the board (with no mods on my part). All those in your post look the same to me. What gives?

I first clicked on the article hoping to get an answer for the crappier font rendering in Chrome on Win32. Font rendering is one thing IE still does better than Chrome/WebKit.