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I'm upgrading for the improved T-mobile reception.
*in select markets only.

But yeah, hopefully I'm in an area where T-Mobile has deployed their long range LTE. I'm upgrading for force touch, the A9 with 2GB RAM, and the durability in that order. Everything else is a bonus.
 
I think you're looking at Auto Image Stabilization. Not the same thing.

From Apple's web site:

Optical image stabilization (iPhone 6s Plus only)

Possibly, but the iPhone has had software video stabilization since the 4s. It did this by cropping the edges and smoothing out the video. This is the first time the iPhone has used OIS for videos.

The 5s had a bigger aperture at f/2.2
15% bigger sensor
Bigger pixel size at 1.5µm
True tone
Burst shots
Slow-mo
Exposure changes for panorama

It's quite an improvement over the 5

Huh, never got into the nitty gritty of the 5s' camera. That was much improved over the 5's sensor.
 
Possibly, but the iPhone has had software video stabilization since the 4s. It did this by cropping the edges and smoothing out the video. This is the first time the iPhone has used OIS for videos.

I think it's pretty clear by the bolded text I pasted from Apple.

Optical image stabilization (iPhone 6s Plus only)
 
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