Back in the day, when I shot film as a professional, the flash sync on my Mamiya C330 crashed in the middle of an assignment at night. I had to revert to hand-holding my just CLA'd Contax I at 1/5 second on a 50/2.8 Tessar. Upon inspection of the contacts, the 35mm shots all sold and none of the 2-1/4 shots. I've since been hooked on Zeiss lenses and still use my "modern" Contax IIA. There is very little sound or vibration and the pictures can be spectacular. While there is a slight parallax difference compared to the SLR's, I'd go all the way with RF and Zeiss.