Most people forget to turn off the Display Settings Effect when stopping the lens down in low light. The lens aperture closes with the Settings Effect on, and that slows AF as it has less light to work with. Turning it off means the aperture stays open, closing down only when the shutter is triggered. If you are using the lens wide open, this doesn't matter, but it is pretty likely that the DOF is making people set the aperture smaller when using a faster prime.
Face Detect, Eye AF, and Lock On AF, probably would provide a lot of what people are doing with the touch screen on the 5n. It's a little more work getting used to using the features, but it probably is even quicker to use the new AF features than a touch screen, especially if you are using the EVF.
Thank you
Russell