In every way.
1. Faster
2. Fingerprint done right (faster than the iphone)
3. Camera tops the IPhone 6, best yet on a smartphone.
4. Etc......
have to agree that spec wise its better. camera is also way better on s6. $200 to go from 32gb to 128gb is kind of absurd (a micro sd of 128 is less than $100), but I could deal with that. Waterproof is nice, but not a killer, however the non removable battery would really make me pause. If you can deal with those 3 things, then go for the s6.
The qi/powermat charging is nice, but it's slow. It also has quick charge which can charge at about 1% per minute or so.