The new released EF 11-24mm f/4L USM lens now back in stock again at B&H Photo Video and Adorama. This is a great lens according to these reviews.
EF 11-24mm f/4L USM lens – $2,999.00 – at B&H Photo Video
EF 11-24mm f/4L USM lens – $2,999.00 – at Adorama.com
EF 11-24mm f/4L USM lens Official Sample Images