since i got he 24-105L for my 5D2 as an everyday lens, i've been happy using it outdoor. in indoor situation, i miss the f2.8 and the fast focus like on my 17-55. i'd be the first to admit, i suck at flash photography and try to avoid it as much as possible. 5D2 + 50 f1.4 allows me to shoot indoor with just natural light or whatever ambient light is available. likewise on my 30D + 17-55, it give me both the range and the ability to shoot natural light.
so is there such a lens that is 24-105mm f2.8 IS with fast focus and tack sharp images? i know there's the 24-70, but back-focus issue, brick weight, no-IS is a deal breaker for me, even though it's tack sharp when no back focus issue.
is there anything like that on the market? i've always stuck to canon lens only, but for what i'm looking for to use on my 5D2, i am open to other brands that can give me what i need.
thanks in advance for your suggestions.