Samsung has published an Advertisement comparing features of iPhone5 and Galaxy S3. Samsung has shown various features which are not available in iPhone5 as claimed by Samsung in this AD. Here is that much talked about AD:
(Source: Samsung)
For detailed comparison between Apple iPhone 5 and Samsung Galaxy S3 and reviews read here: http://www.wwwlabz.com/apple-iphone-5-or-samsung-galaxy-s-iii-which-one-is-better-choice