Definitely looks appealing. I wish it were smaller. Would have given up a stop for smaller. Yet another filter size for yet another prime. That and the price are probably the biggest stickers for me.
Their filter sizes are all over the map. 67mm in this case for a 24mm equivalent seems large (I'm sure there's a reason). But anyway, 58 for the 14mm, 67 for the 16mm, 52 for the 35mm, 62 for the 56mm…. And of course, 72 for the 10-24mm, 62 for the 55-200mm, etc….
But I imagine it's going to be one sweet lens.