IOS 9.2.1 vs IOS 9.2, using iphone 4, 4s, 5, 5s, 6s, 6s plus

Interesting comparison between IOS 9.2.1 and IOS 9.2, using iphone 4, iphone 4s iPhone 5, iPhone 5s, iPhone 6, iPhone 6s, iPhone 6s plus, iPhone 5C