I don't know the specifics of iOS 4, or why you chose that. But will simply respond regarding what Apple has, shall we say, emulated.
How about setting up the device without having to tether it to a "real" computer? Android came out, day one, as a self-contained, empowered computer. iOS came out as a device that was expected to have an umbilical to a computer.
How about multitasking? Apple's flavor of multitasking (the freeze-drying of processes, etc) was a virtual mirror of Android's.
I would say notification center, but the notification center in iOS is absolutely atrocious (it is almost entirely a spam vehicle for games to post solicitations). It is years behind Android there.
The widely heralded iCloud offers functionality (device backup, etc) in Android years earlier. Voice commands...in Android years earlier. Apple is brilliant at marketing every difference, but they most certainly were behind.
My iPad (3rd generation) is a glorious web appliance (Safari on iOS remains by far the best mobile browser), however iOS itself feels incredibly stale in comparison to my GS III or my wife's Nexus 4.