We heard about Irix offering a companion 11mm f/4 to go alongside their 15mm f/2.4 back in March, but it looks like it's actually happening soon:
http://photorumors.com/2016/09/02/irix-11mm-f4-full-frame-lens-for-dslr-cameras-rumored-to-be-announced-next-week/
For all of you that only use your EF 11-24mm f/4L as an 11mm prime -- and you know who you are
-- there will soon be a lighter option out there for you, and this one may even have a front filter option (not confirmed, but their 15mm f/2.4 has front filters, so who knows?).
- A
http://photorumors.com/2016/09/02/irix-11mm-f4-full-frame-lens-for-dslr-cameras-rumored-to-be-announced-next-week/
For all of you that only use your EF 11-24mm f/4L as an 11mm prime -- and you know who you are
- A