milky looking granite

I have black granite with bits of brown and silver . I have this throughout the house, all bathrooms, kitchen, fireplaces etc. Since they first installed my granite I was disappointed in the finish in some areas. Some areas seem to have a milky appearance. Other areas that have a bullnose finish you can see how shiny the edge is but thethere is dulling all around the border. The installer said this is normal, but I have compared my granite to others and mine seems to have no luster. I picked all the slabs together with the builder and they were all matched. What can be the cause of this?

Thanks,

Debbie