I am a total Nikon fan and will be for a long time! But, I felt the need to move onto a bigger and better camera so I am buying the Sony a65.
As far as night shots go, Nikon has been on top for a while. Sony has definitely changed that. The night shots are fantastic quality with great color and clarity.
Video is far superior to my Nikon D5000 as well.
Wish me luck with my Sony endeavor!