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ipad pro resolution must better than 6s plus and of course if that happend iphone also involve same display as it -
 
iphone 4S - nothing better but siri
5s - nothing better but Gold color

6S nothing better but i am 100% guarantee 4K camera shooting

clear ultra hd retina resolution than now

people will want it and move on

The iPhone 4s went from single core to dual core CPU, and can run the latest OS 8 and 9 while the iPhone 4 is stuck on iOS 7. It also had a very tangible camera update from 5 to 8 mega pixel.

The 5s got TouchID as well as a 64 bit CPU that is much faster with 64 bit code, that will likely let it last into later iOS versions than the iPhone 5.
 
big change are Siri on 4s - performance no count -" that how it should be every yrs upgrade performance
 
big change are Siri on 4s - performance no count -" that how it should be every yrs upgrade performance
Big feature that people can see/use for 4s was Siri, but just as important of a hardware change was going to a dual-core CPU, which allowed for better and newer features and further progress down the line.
 
I really try and stick with the S models since these models get the hardware bumps while the number variants are just a change in form factor with minor hardware changes.
 
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