https://www.macrumors.com/2016/02/01/ipad-pro-vs-surface-idc-4q15-tablet-sales/
...the iPad Pro outsold Microsoft Surface tablets in its debut quarter in what IDC describes as a "successful" launch.
"Despite lukewarm reviews, the iPad Pro was the clear winner this season as it was the top selling detachable, surpassing notable entries from Microsoft and other PC vendors," said Jitesh Ubrani, Senior Research Analyst with IDC. "It's also important to note that the transition towards detachable tablets has presented positive opportunities for both Apple and Microsoft. However, Google's recent foray into this space has been rather lackluster as the Android platform will require a lot more refinement to achieve any measurable success.