Well, the XPS 15 handles it like Windows 8.1 handles it, you have a similar selection for the scaling factor (100% etc.), and Gnome/GTK3 has a stepless slider.
The question is whether the applications you use adhere to the scaling factor. Windows has a huge and diverse application ecosystem with different toolkits, which is at times its strength but leads also to little inconsistencies. Hi-dpi screens are pilot devices, only by using them you create the demand for developers to fix their applications over time. Look at the good ones and have patience, the tendency is that everything can only improve.
Smaller ecosystems can easierly keep with the pace. All my main applications are of the GTK3 stack and they scale pixelperfectly (why I didn't return my Yoga 2), but as soon as I use for example third-party applications of different toolkits or Windows applications (like SketchUp), I depend on how well they do.