No demo. I figured KEF and Hegel join forces at so many audio shows that it wouldn't be a system synergy risk.
Small office, no acoustical treatment. Been awhile since I measured but I figure approximately 10'x14'. KEF's bear on IsoAcoustics isolation stands that sit atop a custom standing desk (X-Desk, expensive but very worth it). The desk measures 3.5'x8'. The extra desk width and depth allows the KEF's to be on the desk with no crowding of my workspace and provides some additional speaker distance/separation.
Bass is incredible. I'm a bass player so I demand tight, fast, deep bass. Very happy thus far.