The AMIRA camera is in the 4.1 kg range including the PL lens mount, and about 5.3 kg including viewfinder, battery mount and a camera base plate.
Other cameras may start with lower body weight, but in order to reach acceptable ergonomics, appropriate accessories are needed with additional weight in the range of 1-2 kg. This will raise the total weight remarkably, but nevertheless will not bring the ergonomics to the same high level as AMIRA.