LordCrash The Z Cam K1 is the camera that most VR studios have been using for the past 3-4 years (BDK, VRP, 18VR, etc). The K2 is what most studios have upgraded to in 2020. All the new wider FOV and crisper BDK scenes are all K2, for example. And it's what SLR has been using in 2020 as well.
Update with links: K1 vs K2