The only difference in the cabin width and height between the EMB-120 prop and the RJs is the cabin height on the RJ is 6'0" (1.82 M) against the 5'9" (1.76 M) on the 120. The widths are the same on both aircraft 6'11" (2.10 M). One factor, other than the speed, that leads to a more comfortable flight on the RJ is the lack of the turboprop engine vibration noticed when sitting near the wings on the 120.