Rarely any work can be done as good as from factory and that's unfortunate! Did you use a Mazda dealer or a body shop? Is the leather seat cover the OEM or aftermarket? Yeah I saw some of the very sharp glass pieces and how the leather got damaged by the sharp glass piece in your picture. I hate to say Mazda uses inferior tempered glass (like windshield?) but none of the broken glass pieces were like that from our BMW 528i and Honda CR-V which got broken-in.
The leather seat cover is OEM, but the work was done at a insurance-approved body shop with good ratings and reviews. I chose them because they offered lifetime warranty on their work while the dealer only offered 90 days.
My biggest worry at this point is how the glass shattered. Safety and crash test ratings are big reasons why I bought this car. Its the family car for us and it worries me that Mazda cut corners here.