It's interesting that you perceive the X to have been thinner. It's actually very slightly thicker (by 0.05mm) than the 13. The 13 is longer (by 3.1mm) and wide

It's interesting that you perceive the X to have been thinner. It's actually very slightly thicker (by 0.05mm) than the 13. The 13 is longer (by 3.1mm) and wider (by 0.6mm) though.