Mitchell has good power in both hands. The most recent lefty fighting from a orthodox stance is Cotto. Brutal power in his jab.
Irony of this fight is, I believe one of the mistakes Mitchell made against Katsidis, is that he got trapped on the ropes, and instead of getting out of there, he decided to try and slip and roll with punches, and got nailed even more, and eventually stopped, only against Murray, staying on the ropes kinda helped him, as he was able to counter Murray's punches whilst he was unloading, which might of helped him conserve a little and come on stronger later the way he did toward the end, he certainly looked the fresher of the two imo.
Cotto! That's who I was thinking of! I just thought Mitchell couldn't carry power up a weight. How wrong was I!