Thankfully there are side-by-side comparisons online for the rest of us.
The 930 looks like a decent performer, I could see some people preferring it over the 6S. Its processing goes toward the ultra-smooth, muted contrast end, whereas the 6S produces more pop. Nothing wrong with either I guess, it's probably a matter of preference. I'd be happy with either result from a phone camera.
The 1020 on the other hand is let down by its poor lens. Its corner performance is way behind the 6S and the 930:
Despite its ridiculous pixel count it actually show
less detail than the 12MP 6S. Check out the stack of toast on this test chart:
Have a pan-around yourself if you don't believe me.