I'm pretty sure it was shot by Leibovitz.
To be honest I get the criticism, and how it looks like EW, but it was never going to be easy to 'fashionise' Mary Poppins, or even edge her look up. With Marie Antoinette, Marilyn, Daisy Buchanan or Lisbeth Salander it's easy because they're already fashion/art icons. As it is the Dior looks amazing on the cover and very apt. I hope Emily's feature will deliver one of those dreamy cinematic type editorials.