Bentley has released a new ad that touches their cars that you're likely to never be able to afford, but in an interesting twist the entire thing was recorded with a few iPhone 5s handsets and assembled using an iPad Air. Granted, they're using fancy add-on lenses and motorized rigs that you probably don't have. And they got to edit it in the back of a $300,000 Bentley Mulsanne. But otherwise, it's just like the videos you can make with your iPhone and iPad.
That said, there are a lot of tools you can add to your arsenal to enhance your iPhone videography capabilities. Your iPhoneography skills, if you will. There are crazy rigs that can mount your lenses and the simpler slip-on Olloclip lenses.
Though it doesn't hurt to have a Bentley Mulsanne with its integrated Wi-Fi network, cellular connection, and plush quilted and perforated leather thrones to bring it all together.