Are my iPhone 4S viewing angles "normal?"

As the title said, I'm wondering if my iPhone 4S viewing angles are typical of what is found in them. I just noticed that although the iPhone 4S has got an IPS screen just like my iPad 2, my iPad 2 doesn't exhibit different "views" when viewed on the left and right sides of the screen. In terms of viewing angles, the screen on my iPhone 4S look more like a TN panel to me instead of an IPS panel. Could an iPod Touch screen somehow made its way into my iPhone 4S during assembly? LOL!

Links to photos below show what I'm talking about:

http://imageshack.us/photo/my-images/233/img2209ff.jpg/

http://imageshack.us/photo/my-images/12/img2207e.jpg/

http://imageshack.us/photo/my-images/39/img2208av.jpg/

Note that the above pictures were taken with the screen at max brightness.

I would like to read about what you guys think.