Most of my composition is done without looking even at or through a camera, only the framing is done via a viewfinder, ground glass screen or occasionally sports finder. This is regardless of camera type or format.

I do use a Crown Graphic & Speed Graphics hand-held and I focus via the screen and frame via the Viewfinder, or Sports finder when I use a wide angle.

On a tripod I use only the ground glass screen with LF.