I don't have Fuji GF670 and no Plaubel 67, but i have hassy and Mamiya 7 and GSW690iii and RZ and recently RB, out of those all the only cameras i will carry for sure are Mamiya 7 and GSW690iii and never look back, my Mamiya 7 is not working but it will be my first choice even if i have GF670 or Plaubel, and i carry GSW690 because this format is large and sharp and it is always blowing away my mind with its quality with any film i through in, B&W or color.