One question that comes to mind when comparing the Super Outbreak with 4/27/11 is the consistency of the ratings. It's probably been debated many times before and I'm not criticizing the surveyors in any way, but I have a hard time believing that on the old rating system we would have just the two EF5/F5 tornadoes from 4/27 and just 11 EF4/F4 tornadoes. It seems some damage indicators that were once F5 are now EF4. Damage from Ringgold and the Tuscaloosa/Birmingham tornadoes certainly seems on par with damage photos of Xenia, Brandenburg or other F5's (even quoted as so by Dr. Forbes on the flyover Tuscaloosa damage). I know they say the difference between F4 and F5 is the most difficult to differentiate, but it's hard to imagine these were not quite as strong as say other F5's which did so much less high end damage, often to a minimal number of structures (Broken Bow, Goessel, Chandler, Oakfield).
Irregardless, like most, I never thought I'd see an outbreak even rival the Super Outbreak.