Not All Kodak DX7590's the Same

I love my Kodak DX7590 given to me by my sister- and mother-in-law.  In fact, I was so pleased with it, my sister-in-law, Barbara, decided to buy her one.  Handy, since we can use the same docking cradle when we're here or at her place.  BUT, we learned something over Christmas.  Apparently without any notice to consumers, Kodak sells some DX7590's with different, and less capable, software packages.  Barb bought hers at Sam's and it has fewer focusing options in it's menu.  And, hers often gets unfocused pictures while mine are sharp when we're taking the same scene from virtually the same location.  Frankly, I think this is quite poor on Kodak's part.