Windows 10 does just as bad a job as Windows 7 at handling high-dpi displays. Especially with multiple displays, and especially where it comes to application support (not sure how much of this is on the application side, but my impression from Retina UI-designing colleagues is that Apple made it really easy for applications to migrate/support both high- and standard- DPI displays).

I've heard the Creators Update has some improvements to display handling, so we'll see how that goes.