No, same design but z1 was more of a pronounced button with easier feedback, however it did feel loose and Could be rattled. The z2 is more firm and to press it, you have to want to. Like I said, it feels better after some use and now I'd say overall is better than z1.
still problem with the 18th batch :/ I think we should really be careful when buying a sony z2 now :/ i guess we should do a list
of the different batch that is available on the market and states its defects/problems, this might help anyone here
i'll quote you in the post for sure
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