When I worked in VFX it was mostly Scientific Linux. A few macs were around for concept artists using Photoshop, and editorial using a proprietary video codec with Final Cut. Most business folks (in vfx called "coordinators" and "producers") used tools that were web-based and cross platform (for example, Autodesk Shotgrid, Confluence, and Jira). A lot of internal development is done in Python so no worries there, either.
In game dev unfortunately it's exclusively Windows. If you bring up even using os.path.join, instead of hardcoding \\ into paths, devs who have never worked in another OS look at you like some sort of paranoid maniac.
Pretty happy with my Lemur Pro, 3.5 years in. I just replaced the battery, which was fairly painless. Also had to replace the wireless radio, which was as easy as popping in a new one. I wasn't happy that it failed, but apparently that's industry wide, not just these laptops. Replacement was like $35. Other than that I've only had cosmetic issues, like the System76 sticker came off, which I don't care about.