British Naval Dominance Or End of an empire?

Compared to the USS South Dakota class, KMS Bismarck's 15 inch guns And eventually the upgraded 16 Inch Guns on the USS Iowa Class, was the HMS King George the V flawed with its 14 Inch main guns other than offering Accuracy and a Thicker Armour belt by cutting weight off the turrets and Combat Load. What do you think of it compared to other Nations Battleships and Battlecruisers