At this point on Win32 Qt might as well be the native UI. They did a better job of maintaining a coherent visual theme that says "Windows" and fits the design patterns than the actual owners of the platform.
I have no idea if this is the case with P4V, but it absolutely is the case with a few other things I use.
I'm just bitter about a couple of apps I use that are all permanently stuck on Qt4 where the vendor seems to have zero intention of caring to ever update them to a newer version of Qt. And ever since getting a HiDPI display, this has been continuously irritating me.