The Hexar is more like an M7 in terms of features, but the build quality is not the same. It feels sort of "dead" in your hands, while the Leica is more alive, if that makes any sense. I did like the auto film advance feature a lot on the Hexar, but preferred the Leica viewfinder. Neither is as nice as a CLAd M3, especially a DS M3. That's a fine machine, and better built than either of the cameras you mentioned by far.
Truthfully, if you don't mind the somewhat noisier shutter, the Bessa R2a/R3a is as good as either (except for the build quality compared to the Leica). I used an R2a for years when I was shooting rangefinders and loved it, especially the eye relief, which worked great w/ my eyeglasses. But if I was going back to rangefinders (doubtful) and had the money to spend, a CLAd DS M3 would be my choice. They're just so much fun to use.