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transfer your contacts to Google/Gmail and then sync your contacts with your Z2
on your lumia open your phonebook and look under settings, perhaps you can find a way to create a VCF file and then just upload it to your gmail on your Xperia
check under export contacts
Not sure if this will work, cause i don't have a windows phone.
But you may try this, is a transfer feature from PC Companion. Fingers cross, hope it works for you.
Try this .
Download PC Companion : http://www.sonymobile.com/global-en/tools/pc-companion/
Launch PC Companion > Xperia Tansfer and click start
Select other devices > select nokia and click start.
Read the instruction on screen and follow the steps than cleck next allow PC Companion to read the contact and transfer.