Over the past year and a bit, I've seen far more Surface Books than before, and I put that entirely down to the delay in Apple releasing the new MBP model. A lot of people wanted a new model, and Apple took their sweet time, so they went for a high-end alternative from Microsoft. Five years ago, most developers at the .NET user groups I attended were either using a MBP, or whatever shitty cheap laptop their company gave them. Now, it's either a Surface Book, a Surface, the odd older MBP, or the cheap work laptop.

In the Linux world, I've only seen a handful of Surfaces, and one guy using a Surface Book with a VirtualBox VM for Debian (my preferred setup too). The average dev still seems to be largely on the Apple train, which is understandable as the MBP is still a fantastic device.

Outside of the development world, I see a few Surfaces in the wild, but nowhere near the amount of Macbooks I see. It's definitely grown/growing though, probably because the Surface is a legitimately good machine in a sea of alright to mediocre machines. I'd say that for every twenty Macbooks I see in the wild, I see one Surface, which is pretty good. In terms of TV, that's probably about the same too, since Apple machines seem to be everywhere on TV and in the movies.

Disclaimer: Proud Surface Book owner.