We have reported about two mid-ranger ( Lumia 720 successors) coming in August-September time-frame and now we have seen them getting leaked in real-life images too. You can read more about Lumia 830 and Lumia 730 real-life image leaks by clicking on the links ( Though the Lumia 830 & Lumia 730 names still need to be confirmed ).
We have also shared some confirmed and some probable specs about these two. Above images combines leaked images of both and give an idea about how their design compare to each other.
Obviously one ( Lumia 830 ) will be promoted as higher-end while the second one (Lumia 730) will be promoted as slightly lower-end. The below table tries to capture the differences & similarities between two and while these are true to best of our knowledge, we may be wrong too.
Lumia 830 | vs | Lumia 730
1) Display: 5-inch | vs | 4.7 inch with similar 720p resolution
2) Design: Metal Frame with polycarbonate back | vs | Polycarbonate Unibody
3) Processor: Quad-core Snapdragon 400 | vs | Quad-core Snapdragon 400
4) Rear Camera: 13 MP PureView camera | vs | 6.7 MP camera with Carl-Zeiss optics
5) FFC: 2 MP | vs | 5 MP
6) UI Navigation: Hardware touch buttons | vs | Hidable On-screen touch buttons
8) Camera Button | vs | No Camera Button
9) Both will run Windows Phone 8.1 update 1 out of box
There is much more, which still remains undisclosed. Stay tuned!!