Other than being underpowered and relying on a transmission that was far to light for the task the King Tiger was years ahead of any design emerging from WWII.
Sure the Soviets released the JS II at the end of WWII yet if a JS II and a King Tiger were to duel I would place my bet on the Tiger II! Mainly for the accuracy & velocity of the longer barrel '88.
Another factor is how modern the tank looks. It would not look out of place on a modern battle field and even the formidable M1A1 Abrams borrowed some design ideas from Germany's late WW II monster.
Low in numbers the Tiger II left a large impression.
Looking forward to your build!
Have a R/C Tiger II to finish up one day, field trials were successful, time to do the exterior decorating.