The canon performs better on both noise and bit depth at the deepest ends of the shadow however the Leica maintains an overall sharper and detailed image. At ...
Overall, the Leica wins because of its great sensor coupled with Leica's superior optics. Canon's 21MP sensor is about as good, but the end results only match ...
The Canon was just faster in most situations and the tracking was MUCH better. But for portraits and regular life stuff I haven't noticed an issue at all.