I'll eat my sandwich if an 8 megapixel camera on a slimmer iPhone is better than a 5 megapixel camera. The top of the range canon point and shoot is only 10 megapixels.
All 8 megapixel photos do is make the file size bigger making them take longer to upload to cloud via photostream, draining more battery. They will likely have poorer, or at least not better low light performance.
Please stick with 5 megapixels and concentrate on a better Lens.