Ah, I like this thread. Was just talking about this to my bro.
To me, the action was spectacular and Snyder put on a show in how Supes and Zod came to battle.
But, it was the small things that made Cavill's performance as Superman FLAWLESS. His voice. Not necc the sound of it (though perfect, haha) but the way he expressed his words.
The way Cavill spoke the part in many instances JUMPED RIGHT OUT to me when I thought of my comic-book Superman. I view Reeve's version as Christoper Reeve. Cavill put the modern COMIC BOOK touch to his performance and felt more like Superman in dialogue to me.
In the Smallville battle, I loved when Supes and Faora are walking towards each other and the people in the streets are locking the store doors to get away. The way Supes ushers them to safety through his words was just spot on. "Get to safety. It isn't safe here..."
Same battle of Smallville, Supes noticed a fallen soldier out of his aircraft fighting off two Kryptonians, stops, flys underneath, saves the solider, puts him down and asks "Are you okay?" With a gentle shoulder grab. Man, that was so Superman!