After searching all over, why my Intensity Pro 4 K doesn't get HDMI-UHD from the MultiView 4 HD it became clear, finally after picking up the manual, that the MultiView 4 HD, opposite of its companions (the MultiView 4 and the MultiView 16), does not support UHD Output. Whereas it becomes clear that reading from left to right and from the top to the bottom is the thing to do...
The glossy brochures are a bit misleading when it comes to this little detail...it is in the fine print.