Actually, I did the same (without having a MacBook on advance). The X1 can easily have a similar price tag (I paid 2400€ for 1TB,16GB,i7,X1 yoga). And the hardware is of similar quality.
I'm just using KDE (Plasma) on ordinary Ubuntu, having the kubuntu-desktop package installed for getting KDE-related system tools.
It really works great out of the box. Every hardware feature is covered, even plugging in the notebook into the docking station and seamlessly switching to a multi-monitor setup.