Wow, that is really unlucky. Are you sure you haven't got a dud? We have had a catalogue of accidents with our Zs (Z3 and Z3C). Honestly, you wouldn't believe it. Initially we both only had film protectors on the front and back of the devices. I threw my compact down the carpeted stairs onto a wooden floor. I then knocked it off the worktop onto the tiled kitchen floor. Next the Z got dropped onto our neighbour's wooden floor - Mrs K flipped it out of her bag when looking for a book. Not a scratch on either device. However I thought we were tempting fate, so I invested in a couple of Ringke clear cases. Since then the Z has taken another tumble, and my compact got knocked out of my hand and landed, corner first, onto concrete. And you know what? I wasn't even that worried, I was pretty sure it would be OK. Not doubting you at all, just pointing out our somewhat different experiences. I guess we have just been lucky.Another one bites the dust. My wife dropped her Z3c from about two feet up onto CARPET. And it was in a CASE. Screen shattered and, of course, touchscreen unresponsive.
Of course having said all of that, no doubt I'll drop it again tomorrow and it'll smash into a thousand pieces!