Cesare, my Bronica RF645 shoots in the portrait mode. It took me all of 15 minutes or so to get used to surveying the view. Saying that, my composition needs work regarding the frame lines, but other than that the camera feels right in the hand, is whisper quiet, the meter tallies with my Sekonic when used in incident light mode. Flash sync at any shutter speed, the fastest being 500th which is a bit of a bug bear, but, it works for me.
The lenses are sharp, although not very fast. F4 being the maximum.