The SSD Review published a review on the Sony VAIO Pro 13 Touch Ultrabook - Pre-Configured SATA PCIe SSD Far From Ideal

A quote from the article:

Something not many people are aware of is that there are actually two physically different Sony VAIO Pro 13 ultrabook configurations being distributed, those that have been constructed for pre-configured sales and those for custom build. Pre-configured configurations may use a SATA based PCIe SSD, while all custom builds use a much higher performing native PCIe SSD. We were a bit confused as Sony was clearly advertising PCIe solid state drive in its configurations worldwide, and even stating that the PCIe booted-up faster, launched apps at lightning speeds and enjoy snappier overall performance capabilities versus a traditional mSATA SSD drive In the case of pre-configured SATA PCIe SSD systems, this marketing is incorrect.

 Sony VAIO Pro 13 Touch Ultrabook Review - Pre-Configured SATA PCIe SSD Far From Ideal @ The SSD Review