shiny fan leaves

i notice that some of my fan leaves are glossy and shiny and some are just matt looking. what make 'em shiny I wonder? how should they look, matt or glossy?

I have em on my plant as well... but the glossy ones are all on the lower portion of the plant. I'm thinking that maybe its due to a lack of light.

It just means they are in good health, leafs say alot, and a nice shine is a very good thing, think of it as a womans hair.