Most Z owners complain that they cant see their cars from the outside driving around ,I suspect the Mustang owners wont have that issue,it will be like "Oh that is what may car looks like when I'm driving around "or "wow that is what my car would look like if I had bought a red/blue/black etc. colored Mustang".
Ask yourself this when was the last time you drove around the block to look at Mustang again.btw I did this yesterday to look at a 350 nismo I saw out of the corner of my eye.
Meanwhile the Z owners will just have to find a big department store window to drive buy on a sunny day to see what their Z looks like from the outside driving around...... come on admit you've done this