I can load a CL faster then my m6. The back on CL is similar to the Nikon RF. the trick w/ the CL was use the neck strap to hang both sides of the camera around your neck while u are replacing film. I have used this trick before while running to catch to my wife after taking a shot a Zion...
The Nikon rf does not have the same setup in terms of the neck strap, but one can still put the back in your pocket while changing. So not quite as ast as the CL, but could still be faster then the my m6, since the bottom needs to be put in your pocket as well and there is only a small flip up film winder to make minor adjustments to film leader positioning.
But at end of they day, if u are really good at film changing, I don't think anyone style will beat the other.
Gary