This week, I bought myself a brand new 2017 15″ MacBook Pro, upgrading from an early 2013 15″ MacBook Pro (with Retina). I was able to migrate all my data in a matter of hours, and this is the process I followed (using Thunderbolt 2 to USB-C).
Migrating from MacBook (Thunderbolt 2) to MacBook 2016/17 (USB-C)
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