You're talking about DOF again, not a specific "look" that different that is intrinsic to a particular format. I think what you're wanting to say is that OOF areas in larger format cameras fall away at a more hyperbolic rate than on a smaller format, but that isn't the case, bokeh is proportional to distance, the relationship (regardless of lens or sensor size) is linear. Some lens/sensor combinations have steeper rates of focus loss in and out of the plane of focus, and others have flatter - any one of the variables (sensor size, aperture, lens length) can be compensated for by the other variables.
It's so often mentioned online about certain format "looks", which is basically a myth - not to mention never actually explained empirically by people who claim to appreciate it. Certain lenses have different characteristics, certain lens designs are better suited to certain relative focal lengths, and different sensors have different qualities, but the format itself isn't the sole factor in deciding if and how things go out of focus.