What can the iPhone 6 do that the iPhone 5 can't?

What can the iPhone 6 do that the iPhone 5 can't?

NFC, Apple Pay use
Healthbook app use (without 3rd party hardware)
Take advantage of Apple's Metal graphics enhancements for games
Get things done faster
Take better pictures
Shoot slo-mo video
Touch ID
etc

Not much.

NFC and iPay stuff so far.

It is just bigger

Not much. Apple make one little improvement and everyone lines up to throw away $600. You could have bought a samsung GS3 in 2011 and had all the features that the iphone is just catching up to

Fingerprint scanning (Touch ID)
Reachability
Apple Pay (NFC)
It has a big display
Slo-mo up to 240fps
"Hey Siri" without plugging in
Panaroma up to 43MP
64-bit processing power
True Tone Flash
128 GB storage option
Focus Pixels
DIS
Apple Metal Graphics API
Better Facetime camera

Apple A8 Chip
Apple M8 motion co-processor
PowerVR GX6650 GPU
Bigger size
Better screen resolution (750 x 1334)
Bigger battery (1810 mAh battery capacity)
Changed sensor of Camera (1/3-inch sensor, f2.2 aperture)
802.11ac Wi-Fi
20 bands LTE

That's all I guess, there maybe more.