For those that were interested, here is the difference in vivid detail between an EF-4 and an EF-5. The EF-5 that hit in North Alabama didn't hit a major population center, but stayed on the ground for 90 miles and killed at least 70. The destruction was amazing.
132 Miles of Devastation: EF-5 tornado deadliest in United States in last 56 years | al.com
It is the difference between destroying houses and building, and actually sucking asphalt and concrete from the ground. Wow.