@gsbaker - I did not see that effect re the PPF. I took a tour of a local shop, and they had me do a detailed eye and touch inspection (of the Ferrari, Porches and Teslas there). The color and view on the panels with and those without PPF is indistinguishable if done correctly. If a shop cuts the film too ”tight,” then you will see the border/edge near the panel edge. That’s poor workmanship.
Also, they had me look at the before / after spots of what they do to prep the paint before applying the film on brand new cars from the dealer. The difference is truly noticeable. It’s unreal how much can be done to improve the paint finish even when it comes brand new. Now, not sure how much of that could also be done at home with fine polishes, but it is noticeable nonetheless.
As for the polarized sunglasses effect, I didn’t put any on in the shop.