I don't actually do portrait photography Sir, but I do use the Fooj (X-T1 & X-T2) units extensively in my studios for everything except when the call is for MF or LF photography. I've found them to be perfectly suitable and easily capable of producing high quality studio work within their limitations obviously.
I've been so impressed with the quality that can be obtained from these units that I have designed & made a system of being able to use my LF lenses on them with a full set of technical camera (lens panel) movements ie rise/fall/tilt/swing/side shift etc, enabling me to use them for some commercial work.
If you ever decide to make a pilgrimage up to Northamptonshire or down to Kent, then if I'm around you'd be made more than welcome to join us for a time, and try things out in our setups.
George.