Sufficient, I guess, but not as much as he could have been. Vader seems to want the fight as a one-on-one. In fact, I wonder if Ben would have even sacrificed himself had he not seen Luke near the Falcon, and having a chance to escape with the Princess & the data. It's a little like Ben is developing his plan on whatever circumstances present themselves. Or - as a certain someone else once said - "I'm making this up as I go."
;-)