I don't think they look all that similar. If you can't tell a Z from a 911, then you must not know much about cars at all.
If I were to pull up next to a 911 at a stoplight (which hasn't happened yet) I would give the driver a
to complement them on their awesome car.
Of course people would rather be seen in a 911 than a Z. I have no clue why you're even comparing the 2. Your comparing a $30-40k Nissan to a $80-200k Porsche. At least compare it to the GT-R.