A few days ago, Sigma announced that some of their lenses may be incompatible with the Nikon D5300, and now they’ve said the same about the Df. The Japanese company announced that their lenses may experience incompatibility issues with the new Nikon Df as well.
Both lenses with internal focus engine and those without it are affected by this. Just how it happened with the D5300, you can fix this by getting the most recent firmware update.
Also, the lenses that already come with this issue solved by default will by identified by stickers that indicate the compatibility with the Nikon D5300, the Df or both.