You can watch the last film of Pavel Lungin, "Tsar", to realize his "bloody aspect".
This is cinema but not fiction.
It's also important to know how Ivan became "Terrible". Younger, he was a "nice" boy. But the atmosphere of Russia at this time was absolutely awful. All the boyards wanted to become tsar, dreaming to kill the little Ivan (that's what happened later with his son Dimitri). He became tsar and got married with Anastasia Romanova. Anastasia died from illness but Ivan was convinced that boyards killed her. That's how he became completely paranoid and it worsened year after year.
Impossible to compare Stalin and him.
The country, the time, everything was different.
Edit : At the end of XX century, scientists analysed the corpse of Anastasia. They realize that Ivan was probably right...