Lord Grievous said:

While I love the colour correction, I'm actually inclined to think that the original buildings and sky in the background look better.

It's not a technical detail, but I just think that the original designs of those buildings together with the beautiful blue sky and pearl-white clouds look more inviting than the soft-white buildings from the new shots.

Maybe it's because it looks more surreal (fairytale-like) but I just don't like this new background much.

I'm not saying that the original background couldn't use some sprucing up, but maybe you will consider leaving it more as it was before?

The new color of the walls were done to match the rest of the shots.

The new buildings were placed to match the architecture and to fix the bad perspective.

The sky was replaced to match the new bespin shot that luke arrives(as we see in trailer) before.

-Angel