Force sensing is nowhere near that specific, and I might remind you of Dooku's statement about with Force powers being equal, a duel is the only way to resolve who is the strongest. So, not only are Force use and dueling not considered the same thing, but use of a lightsaber is seen as a greater ability than use of the Force.
"Second he's a master Martial Artist, he would have cut down Obi-Wan as soon as he landed if not before"
It would seem that Ben learns this lesson in ROTS.
I'd have to say that ESB is my favorite duel, both for the choreography and the underlying tension. ANH is my second, and ROTJ is my third.
Although Obi-won/Qui-gon vs. Maul is cool to watch, and the music goes very well with it. Maybe I should try my hand at editing out the cuts to the space battle and Padme, and see how it looks then.