Interesting. What are your thoughts on the CM1 ?

I try to follow camera optics closely, especially on "superphones".
I'd have to rate the cameras as such (ordered in terms of most to least important test):

Normal shots (well lit, non-moving, medium-close range)
Nokia 808 = 9/10
Lumia 1020 = 8.5/10
iPhone 6 Plus = 8/10
Samsung K1 Zoom = 8/10
NOTE 4 = 7.5/10
SONY Z3 = 7.5/10

Quick shots (well lit, fast moving, medium range)
iPhone 6+ = 9/10
Lumia 1020 = 8.5/10
NOTE 4 = 8.5/10
SONY Z3 = 8/10
Nokia 808 = 7.5/10
Samsung K1 = 7/10

Low light (low lit, non-moving, close range)
Lumia 1020 = 9/10
Nokia 808 = 8.5/10
iPhone 6+ = 8/10
Samsung K1 = 8/10
NOTE 4 = 8/10
SONY Z3 = 7.5/10

Macro shots (well lit, non-moving, super close range)
iPhone 6+ = 9/10
NOTE 4 = 8/10
Lumia 1020 = 8/10
Samsung K1 = 7.5/10
SONY Z3 = 7/10
Nokia 808 = 6/10

Zoom shots (well lit, non-moving, long range)
Samsung K1 = 9/10
Lumia 1020 = 9/10
iPhone 6+ = 8.5/10
Nokia 808 = 8/10
NOTE 4 = 8/10
SONY Z3 = 7/10

Conclusion?
Nokia 808... one of the best, but its easily the worst phone, and not worth the trade-off. Skip this option, its a no-brainer
Samsung K1 Zoom... pretty decent shooter, but there are better camera-phones and they aren't nearly as large. Skip it.
SONY Z3.... arguably the worst camera but best phone contender in this showdown. Still a great camera "for a phone". Worth thinking about.
NOTE 4.... same deal as the Z3, but its slightly a worse phone with a better camera. Again, worth thinking about.

Lumia 1020... the overall best camera in this showdown. And much smaller than a dedicated point n shoot. However it suffers from a weaker ecosystem, and older/slower technology. Its sluggishly slow at launching the camera application, and quite slow at focusing and capturing a shot. It also lacks some options like 4K or slow motion recording.
iPhone 6 Plus... overall its the third best camera in this showdown. Its arguably one of the best phones. On top of this, it has one of the quickest camera app launch and shooting time performances. It also boasts longer battery life than the Lumia 1020, Nokia 808 or K1 Zoom while performing as a cameraphone. Overall, this is the best camera phone out there... very narrowly besting the 1020 due to its crippling faults.

Its phenomenal to see the quality of shots taken by the 6+ considering the thinness of the device and the size of the lens. It takes consistent shots, its speedy, and overall a great camera. The SONY Z3 does perform similarly but it lacks OIS, a good flash and does more post-processing... which add up to make a more average shot.


PS The LG G3 is also one of the best out there, and performs somewhere between the Nokia 808 and the SONY Z3. However, I haven't tested it out thoroughly and haven't made a comparison to these models yet. Its recommendation would be similar to the SONY Z3 or NOTE 4, but probably with more reservations due to a slightly stronger post-processing and underwhelming battery life. The Microsoft 1520 wasn't included because there's already enough Nokias here. In terms of performance, its quite close to the NOTE 4, which makes it a device not worth recommending over the Z3 or the N4 due to obvious reasons.