Many high res wallpapers look zoomed in in IOS7. Especially wallpapers set at the 1136x640 @ 326 ppi look off as you can see in the image above.
To fix this go to your settings.
Here is the important part. You will see "reduce motion" which defaults to off.
You will want to turn it on.
Now go back to wallpapers & brightness and pick your wallpapers. They will scale properly.
As you can see here! They fit!
As does the lock screen graphic! I hope this helps you!