Dang, now I have to make some cornbread this weekend. One of my favorites and gotta have pinto beans and ham with it! I also throw mine together, using coarse grind cornmeal and a hot cast iron skillet.
White cornmeal is naturally sweeter than yellow. Silver queen sweet corn is much sweeter than yellow - same applies for the cornmeal.
I also never add sugar to mine, but my SIL does. The first time she made cornbread for my brother, he called our mom almost in tears because "Bonnie put SUGAR in her cornbread!!!" My mom told him to shut up and eat it. I thought I would laugh myself to death when I heard her tell him that! From that day forward, she makes a small batch with sugar for her and plain for him. LOL!