what are the goddesses dynamics with each other? do luna and celestia still have a strong sisterly bond like when they were ponies or have their perception of emotion changed with godhood?
In the thousand years Luna was imprisoned, her sister remained in the world, being the sun and amassing worship, cementing herself as biggest lifegiving force in the world. This allowed her to grow higher than the tallest mountain, while Luna emerges still smaller than her sister even used to be.
To put it in perspective, see that little green smear in the bottom left?
That's Canterlot. The biggest city in equestria.
Luna is only a little bigger than that. Before the banishment, Celestia was less than twice Luna's size. But she grew while luna barely did. Luna was feared as the dreaded Nightmare Moon, which grew her corrupted power, but it could not measure up to the sun.
After being freed, she established her place as keeper of the night and queen of Dreams, which allowed her to grow once again, but she still doesn't reach Celestia's scale.
This is how things are about a century after the events of g4.
Luna is much more connected to ponykind than celestia is. She can visit individual dreams and connect with ponies that way, while Celestia doesn't bother. Her bond with Celestia is strong, post release, but will always be fractured while Luna has one hoof among mortals.
Eventually, Twilight will encourage them to stop meddling in mortal politics, and they will concentrate on bigger things like the weather and health of the planet. Once both of them become equal parts of the sky, they will become as close again as they were in foalhood. Right now there is an imbalance in size and power due to ponies worshiping/believing in the goddess of the day, but less celebrating the goddess of night. After luna is freed, appreciation of her grows massively and she catches up to be closer to celestia's size.
The other two goddesses have a sisterly relationship as well. They are both young, and represent different types of love. They are closer to mortals than they are to the sky gods, and they are closer to each other than they are to mortals. Still, because they are rooted in mortals' feelings for each together, they will always be more connected than the sisters are.
However, one must remember that gods are capable of emotions beyond mortal comprehension.







