A good company looks at the competition and takes apart what they are doing right and wrong. Its what the company I work for does. We own a copy every competitors software. When a new version comes out we look at each change to see if there is anything we can learn and if we need to react to it. I am sure competitors do similar things with our products.
Its how you react to this study which defines you I guess. We don't just clone features. If we need to react to a feature we will probably put in something similar but it will be our take on it so it fits with our design and UI principles.
Contrast this to Samsung. This document does look like a lot like. "On the right is what we have now. On the left is how it should work." This is probably why they are being sued.