Indeed, which is why I think Iowa vs Bismarck 1-on-1 would most likely result in both ships limping back to port after sustaining severe damage and high casualties.
The general idea most people have about Bismarck and Hood is that Bismarck opened fire and scored a lucky hit on Hood and that's it... People often overlook that during the Battle of the Denmark Strait, Bismarck wasn't facing off against only the Hood, but also against the Prince of Wales, a King George V class battleship, the most modern British battleships used during WWII (she was in fact younger than Bismarck). The British ships opened fire first, and scored the first hit: a 14" shell from Prince of Wales hit Bismarck's bow. Prince of Wales would hit Bismarck two more times before the battle was over.
Also Bismarck did not hit Hood just once, and it was not the first hit that blew her up. Hood was first hit on the boat deck, starting a fire and setting off some ammunition, but this was not fatal and did not spread. A probable second hit on Hood damaged her bridge and radar systems. The third, and fatal hit to Hood's aft magazine didn't happen until eight minutes after the British had opened fire.
Bismarck then turned her guns on the Prince of Wales. She was hit four times by Bismarck and three times by Prinz Eugen, seriously damaging her superstructure and fire command systems, and holing her hull below her armor belt. Captain Leach wisely laid down smoke and withdrew when he realized he could no longer realistically hope to further damage Bismarck. Also Prinz Eugen was closing to torpedo range and Leach feared he would lose his ship for nothing.
In the space of 10 minutes Bismarck (firing 93 shells from her main armament), aided by Prinz Eugen, had sunk the Hood and rendered the King George V class battleship Prince of Wales combat ineffective. Bismarck herself had only suffered minor damage, but her loss of fuel and two knots reduced speed would later contribute to her demise. Admiral Lütjens let Prince of Wales escape despite staunch, and repeated protests from Captain Lindemann. This may have been a mistake by Lütjens, but he had strict orders not to engage the RN if he could avoid it.
As for Bismarck's final battle... Firing while turning was not something the mechanical computers and fire control system of that time could handle very well. Being unmaneuverable Bismarck had little or no chance to hit with her main armament as she was wandering aimlessly through the battle, though she managed to straddle the enemy ships a couple of times. The British pounded her for two hours with battleships and cruisers, firing 2,800 shells scoring more than 400 hits, and torpedoed her twice before she finally succumbed to the sea. Some even claim the Germans had to scuttle her.
