Yes, the "desktop" is basically Windows with some traces of Macs :). For server-like systems, Linux has pretty much "won" though. Which probably is the reason why MS is working on WSL. There are also a lot of GUI applications, which run mostly on Linux because their work domain fits in a server-like setup - and be it even for data protection reasons where the applications are running on a server cluster accessed by a remote protocol like Citrix.