+1
The dual sim Asus Zenfone 3 (ZE552KL model) has an awesome camera (f-stop of 2.0) and the phone is actually quite reasonably priced.

 I have read some really good reviews for the Hwuawei P9 camera as well.  It uses quality Leica lenses.

 Here's a side-by-side comparison:
 http://www.gsmarena.com/compare.php3?idPhone1=7972&idPhone2=8106