Well Our ZL doesnt have that big notch at the bottom and we dont have glass backs....
I don't think that is likely to happen on ZL, not accidentally though. First, the microphone notch is smaller (as said above) & placed to a side (near front cam). Second, not having a glass back means no need of an attempt to clean it like OP (in case of XZ) did 
, thereby avoiding the mess. Textured matte back (black ZL) doesn't get dirty easily.
Cracking glass back?.. well, totally out of question for ZL.
, thereby avoiding the mess. Textured matte back (black ZL) doesn't get dirty easily. Cracking glass back?.. well, totally out of question for ZL
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