That is the thing. The S models are excellent upgrades because of ONE big, revolutionary reason. With the iPhone 3GS, we got a really fast processor, with the 4S came Siri, the 5S got us TouchID (that resulted in the popularity of fingerprint readers on phones) and the 6S - 3D Touch - a new dimension of interaction.
You see, 3D Touch is eventually going to be a game changer. Once developers start harnessing the power of this technology, it is going to be everywhere. 3D Touch has the potential to completely change the way we play games. You will be able to shoot faster in an FPS game by pressing the screen harder or access hidden menus/functions that doesn’t destroy the beauty of the game. Who knows what the possibilities are… But by next year, expect a lot, lot more from this technology.
There is more to the iPhone 6S that just this. The new TouchID sensor is so fast, you don’t even see a glimpse of the lock screen when you press the home button. Live photos is another feature that Apple stresses about: whenever you take a picture, the camera records 1.5 seconds of content before and after the shot, essentially capturing the moment. Later, when you view the photo in your camera roll, you can 3D Touch to view the tiny clip. If this same concept was first implemented in a Samsung or an HTC, it would be considered a gimmick. On the iPhone 6S though, it clearly isn’t. At least considering the amount of work they put into for developing this feature.
Apart from 3D Touch, the greatest change in this iPhone are the new cameras. Apple finally moved to a 12 MP iSight camera from the 8 MP module found on the 5S and above. The biggest new feature of it is the ability to 4K video. The quality is super crispy, but without Optical Image Stabilisation on the 6S (the 6S Plus has it), it isn’t all that amazing. Apple also boasted that its A9 chip can even edit 4K video on the go. When it comes to pictures, you get amazing detail and true colour. It isn’t a huge jump from the iPhone 6 camera, but there is nothing you are losing out on. The front FaceTime camera is now 5 MP, and the phone uses its display as a front facing flash! This is possible only because of a new display driver that can brighten up the screen by three times to generate that intensity of light. This is called the ‘Retina Flash’ originating from ‘Retina Display’.
Is it worth paying upwards of $650 to buy this phone? Depends on what phone you are using. If you are upgrading from any iPhone before the iPhone 5S, this is an outstanding upgrade. For anything after that, I believe it is better to wait for the next generation of the iPhone. If you want to enter the iPhone arena and you do not want to pay so much, the iPhone 6 is still a great phone.
What makes the iPhone 6S unique is its incremental yet unbelievable upgrades. Having used many iPhones before, this new phone is nothing very new. There is 3D Touch and live photos and a new camera, but the simplicity of the iPhone still remains. An iPhone is, indeed, an iPhone.