It's TTK is .87 to the head according to Merculus spreadsheet and 1.42 to the body vs Mida at .9 and 1.5. For starters the 1.42 body TTK is pretty slow, lots of guns do 1.3. The head TTK is figuring you hit your first 8 shots in a 3 burst burst land to the head. This will basically never happen IMO. So effectively, it's head TTK will consistently be slower than Mida, probably .93 I'm guessing.
Then, you have to constantly work to keep the shots within a burst on head target. It's a lot more difficult to use than Mida, which is more like "fire and forget".
Then at longer ranges it's really problematic vs Mida, as you'll start getting damage dropoff and it's even harder to hit head shots. A lot of maps it's just not going to compete right off the bat. Frontier, Bannerfall, Widows Court, Memento, Rusted Lands, Exodus Blue, Shores of Time, Timekeeper, realistically, even Blind Watch, Pantheon, and Twilight Gap have areas immensely favorable to Mida, the list is long.
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I want to start trying to use Hand Cannons. I'm started to get a little interested in competitive Destiny PVP, and in last weekends tournament, everybody was using Hand Cannons.
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