I like Luther's version even though I've heard Lalah Hathaway's cover and it's good but I don't care for Lalah's voice that much; I remember she did an album with Joe Sample and even then it was her voice that made me not like the album that much.
Like I said, she's not a bad singer at all, she can definitely sing, but to me her voice isn't as pleasant to the ear as it might be to others.
--------- "We in here talking about later career Prince records & your fool ass is cruising around in a time machine trying to collect props for a couple of sociopathic degenerates" - s.blak