24-35mm F2 DG HSM | Art
As has been pointed out elsewhere, 24-35 provides 24mm/f2, 28mm/f2, 35mm/f2.So it is a 24-28-35 f/2.0. Kind of like a Leica Tri-Elmar.
The problem is that, unlike the Tri-Elmar, it is huge (82mm filter, I hear). I'd love a (presumably) much smaller constant f4 in that range.