There have been a few updates in Safari browsing in iOS 7, one of my favorite changes has been the improvement in management of multiple tabs in iOS 7. Many people use Chrome, Dolphin or another browser regularly on their iPhone. These improvements may be enough to get a few people to switch back.
Here is a demo of Safari in iOS 7 on the iPhone:
Other improvements include:
Unified search/url bar
Screen resizing with scroll
iCloud, recent tabs and search availability