I'm sure they do. But considering the 1.3 cameras are 3-5 times as expensive and the lenses purchased by this group likely FAR outweighs the 1.6 croppers it would make sense to make SOMETHING for them! But I digress. I haven't had an optimal lens for this camera yet, why do I need one now!?!?
I guess they figure you guys like spending money and will buy the L glass anyway.
I imagine it is hard to find wide angle stuff for 1.3x without hacking some APS-C lenses.