I have Dell XPS 9350 and it's not that good. Hardware is cool, though (and only XPS 13 that has 16GB option). I have Ubuntu 15.10 and needed to install custom kernel to get everything working.
How is the battery life? I have this exact model, but I heard skylake had strange sleep or power saving problems under Linux. You have the 3200x1800 display too, and I am curious about scaling too. The drivers are terrible for Windows too. Been on support since November about the failing DPTF drivers.