Batman vs Superman's story involves a complex web of events. There's public pressure, personal vendettas, and a looming threat that forces them to either work together or destroy each other. It's a battle of wills and powers.
Definitely. Batman and Superman have long been featured in DC Comics, and the movie takes inspiration from those comic sources. It incorporates elements and plot points from various comic story arcs.
Well, it's not that straightforward. Ikaris' character is morally ambiguous in the comics. His motives and actions can be interpreted differently by different readers.
One of the best is 'The Dark Knight Returns'. In this story, an older Batman comes out of retirement and clashes with Superman who is sort of a government enforcer. It shows their ideological differences and the grittiness of the Dark Knight against the more 'establishment' Superman.