Yep, we also had some discussion here. There is (I think) some more info here, but a lot of the picture quality these days depends on the hard- and software “behind” the camera sensor. So how well does the hardware (senor and SoC) and the software (often called the Software development kit (SDK)) work together?
And lot of interesting info for this “combined” working devices with the senor is not out there, yet.
The rest of the interesting info is “To Be Determined” 
So I guess we will only figure it out if we look at pictures made by a phone using the sensor. Right know I only now about the Xiaomi Mi 4, but I haven’t see a lot of pictures yet (Use flicker and search for pictures taken by a XIAOMI MI4 … no Xiaomi Redmi2 is the right one, as Fred already pointed out!).
[Update: I made a mistake, it’s the same SoC but a slightly better camera. The Elephone M1 & Xiaomi Redmi2 use the same sensor. The user “maniaK techManiaK.pl” has M1 samples on flicker.]