Chrome may win in terms of raw page rendering, but all browsers are so close that it really doesn't make a huge difference.
The biggest thing that keeps me from Chrome (aside from iCloud integration) is that Chrome lags while scrolling and when playing video if I swipe between spaces I get bad lag. I don't have this with Safari.
For me, it's how long it takes for safari to generate a new tab. It's an absurdly long time for a simple process.
That, and I don't know why the zoom is all askew in safari for some pages. 9Gag for example has all the images blown up. Is there a setting I am missing?