I think the best camera is the one you have on you. A lot of my favourite shots are taken on my phone, not the ones you stick on Flickr or 500px, but the ones that go on Facebook.
If you right click the images and open in a new tab you get a higher res image, but still not good enough to make a real assumption.
The white balance is closest in the first house image (but aires on the cold side). Something is seriously off with the second (both wb and exposure). Third is not only overly warm, but skewed towards magenta also. The lens on the first seems soft and lacks contrast. The third is best in this regards.
On the One X you don't get full resolution unless you disable the 16x9 option, this will make it a fairer test.
The Nexus and One X have have EXIF data recorded, I can see shutter speeds, focal lengths etc. The iPhone has no such data recorded, I opened the image in Apple Aperture. My own iPhones have all recorded relatively extensive EXIF data in Aperture. Has this image been modified? The Samsung apears to be using a spot metering system, as I asume the iPhone is too. The One X apears to be using an evaluative method, switching to a spot metering mode and tapping the same point as you do in the other tests should give a more acurate meter reading.