There's a difference between overall form factor and the actual design of a product. If Kia started selling a car whose profile was nearly indistinguishable from an Infiniti G37, Nissan would have a legitimate beef. Just as Apple does here, and just as they did when people started ripping off their iMac design, once upon a time:
http://en.akihabaranews.com/20416/legacy-unused/pc/retro-wor...
Would you defend that iMac knockoff?
There are innumerable ways to design anything. Just because Apple is willing to spend the money to figure out the best ones for their brand doesn't mean everyone else gets to lift the design whole.