Ideally I do want an F2.8 wide lens. I'm waiting to see what Canon launches over the next year - they just have to release a wide F2.8 lens based on the new 16-35 F4 IS DNA soon.
In the meantime I can hand hold shots at F4, 1/40 at ISO 12,800 in pretty dark rooms and still get decent results.
I'm not a Pro so have no requirement to print 20" photos taken in unlit basements