I saw this article on cnet about how much more accurate the samsung s3's touch sensitivity is compared to the brand new 5c/5s. At first I agreed with the article/picture then shortly after reading it dawned on me how stupid the test is, and how the apple product is likely more accurate in practice.
Basically, using the phone with one hand will result in touching the screen with a varying part of your finger. Where you actually make contact when stretching your finger out is usually not where you were intending. This thought shows up well in the image of the apple products, since the green area is generally touched with the tip of the finger while the red areas generally recieve the sides of the finger.