Just posted: Irix 11mm f/4 Firefly Lens Review.
If you don't have the very-fun and quite useful 11mm focal length covered, this lens is definitely worth considering. It is a very good value.
With a $50 instant savings on the Firefly and a $100 instant rebate on the Blackstone version, this lens is an especially good deal right now.
The Irix 11mm f/4 Firefly Lens is in stock at B&H | Amazon | Adorama | WEX.