I think the one on the bottom has a finger print scanner there hence the design, I have to laugh at you in your attempt to even compare the Nokia camera to an iphone, you do realise that model has the 40 odd megapixel camera plus a PROPER Xenon flash and optical image stabilisation right? On quality it pretty much destroys the iPhone camera. You buy that phone for it's camera! It would literally be a miracle to fit that much of an advanced camera into the phones body. And that hump is a tiny price to pay for a proper xenon flash.
As for the Nexus 5, well it is a very nicely designed phone with a lovely 1080P screen and a 2300 mah battery and is 8.59mm thick, the camera is protruding as it has Optical Image Stabilisation built in...... and it costs HALF the iPhone cost and I very much doubt Google were going to spend the same amount of money Apple does on it's iPhone design, if they did I'm pretty sure the camera would be flush with the body.
So yeah, I am pretty sure with Apples R&D, it's endless resources and money that Google didn't have or spend, it could make a phone the same thickness as the current iPhone and have a flush camera and a 2000 mah battery.
I've no idea about the Samsung phone you posted?
10.4 inches thick and a windows phone to boot hardly a bargin. you dont know what the specs of the 6 will be but I bet it will be on par with the nokia. without 40% of the thickness and an extra 100$.
What planet are you on that battery size means anything when it comes to apple products. The nexus has a 2300 mah battery and still fails epicly worse then the iphone 5s batter which is 1500 mah. that being said the 18** hour battery will probably be on par or destroy most of the compitition along with 3000 mah batteries and has been subsidized by google to make it cheaper cause it performs worse also. cheap is cheap. an dif you think you could tell the differance between a 1080p display or whatever the resoulution on the 6 will be your also funny. the iphone display has been one the the best displyas out casue guess what. Resolution isnt the only thing that matters.