Anyone interested in 20-70mm F/4 L IS?

I think 20-70 or at least 20-60mm range would be extremely useful. I would sell both my 17-40 and 24-105L straight away for such a lens and keep only 70-200 F4 IS. These two zooms (20-70 + 70-200) would be enough for my needs. When needing wider than 20mm, Irix 15mm would be my lens of choice.

Somehow I doubt it will come true though... but maybe Sigma or Tamron decide to make something like that?

18-70? To complement my EF-S 10-18 and 70-300 L. I'm shooting primes in low light (Concerts), but zooms for travel or outdoor. I do want a good mid range zoom someday, but want it to be close to my 18 at the wide end. 20-70 would be fine. I'll lean towards an IS STM, possibly L if money is laying around.

EF18-85 f/4.0L IS STM would be perfect imo. Maybe $1200?

I'd rather f/2.8