I am sure they do, but its always the leader that is followed..Which Samsung galaxy S4 feature have we seen in the 5s? Lets look back post 5s launch? Samsung quickly came out and said that they will try to introduce a 64 bit processor, and they are working on fingerprint technology..Is it just a coincidece that LG , HTC and others tried to get finger print technolgy "Back" soon after it was rumoured to be on the next iPhone (or post launch)? Apple is the market maker in this category, whether the iPhone bashers like it or not..Apple has stuck to its guns despite the competition comming up with larger and larger screens..Tim cook as constantly reiterated that untill and unless certain compromises are mitigated, apple wont look to launch larger phones..They have been critisized for well over a year now for not following the likes of samsung, LG , HTC in launcing a larger iPhone or phablet..Lets see if apple does this year, and if so what compromises in display tech etc they overcome..While apple has resisted in "being" inspired by other's hardware, other OEM have closely tried to pair their devices to what comes out of the cupertino stable..Not to say that this is the "wrong strategy" as doing what the market leader is doing, certainly does not hurt the bottom line, and saves a lot of time..Apple is constantly looking towards technologies to incorporate into its devices..however the real deal is the integration and smoothly it is integrated with the hardware-software optimization..that is much harder to do then to just put out a "feature" for the sake of it !
Just my .02 cents !