What I have found occasionally with my Kiev 60 is that the camera is so heavy that shear inertia tends to reduce vibrations. I have shot it handheld (bracing my elbow against my knee) at 1/125 with the 250mm Jupiter 36 without trouble. The combined weight of the camera and lens dampens most vibrations, in a way you would never find with 35mm.
Of course, I've been known to shoot the Speed Graphic hand held, so I may be more tolerant.
BTW, the fit and finish on Gevorg's Arax cameras is superb.