hello!
i bought a k&f concept adapter for my fuxi xpro(Nikon to fuji adapter)
i have to say i wasn't impressed. when i mounted the adapter i could feel the lens moving slightly. It just wasn't a perfect fit and i could feel a bit of movement(between the lens and Fuji mount)
I know you're looking for an adapter, but keep in mind that bigger lenses in combination with the adapter add up some weight.
Marino