Hi Mike,
I agree on your point, as the ring on the 16-55, does give you a lot more control, i.e. you don't have to be looking in the EVF all the time among other reasons. Same with the 50-140.
I also agree, once you use the 16-55, it's hard to go back to the 18-55. The 16-55, really is an excellent optic, even wide open. (night work)
Paul C