I have another dock that lacks USB ports but pushes from my computer to two 4k monitors. I got the G5 to have a true all-in-one solution (2x4k + USB + power). Unfortunately, despite the documentation saying the G5 can push to 2x4k via DisplayPort, it does not work.
I have tried hooking the two monitors up via DisplayPort as well as 1 DisplayPort and 1 HDMI. In all cases, the G5 only sends 1x4k and 1x2k.
Works fine for USB and 2x2k monitors. Does not work for my setup (2x4k via DP).