I was basically in your situation, except with a 60D (i've got a 10-22 as well as a 70-200 f/4 IS).
I was thinking of getting a 17-55 IS, and I was pleased with the results using it on a 60D for a day. But then I actually bought the 24-70 II (without even testing it) and I'm not regretting it. But then again, I am planning to upgrade to full frame in the early quarter of next year.
Even on a crop sensor camera, this lens still has so much potential. It's just full frame can bring out all it's potential.
Plus, with your 7D (if you're keeping it for a while), you've got a good coverage of focal lengths- 10-22 + 24-70.
My friend BrandonKing96, how about this lens perform at low light?
i mean when you shot using this lens at low light place like church, hall & etc (without using speedlight) at f/2.8, ISO around 800-1600 & shutter 1/125 (base on focal X 1.6 to avoid camera shake when hand held) its still enough light? or need to boost ISO over 1600?
im sorry asking this noob question, because i dont have any lens faster than f/3.5
btw, thanks for sharing
To me, it performs brilliantly! Even though I've only got that 9 AF point compared to your 19 (lol I think it's that).
You'll be blown away by it's f/2.8 performance for low light. I was! I only had 3.5 as my fastest before as well (coincidentally, the 10-22). But even so I think when I finally add some primes after I upgrade to 5D III, those low light performances will absolutely shock me at what I've been missing out on haha
And also, it may just be harder to get the sharper shots due to the weight of the lens. But you get used to it. I'm used to it now after only 2 weeks of having it! But I've learned not to be afraide to jump up to ISO 2500 now.. even 3200 (although i'm using it on a 60D). But I think you'll find you'll be quite please with this lens if you choose to get it.
But this is me talking about the 24-70 II still, not including the 17-55. perhaps someone would come along with information to sway your decision. But both lenses are amazing lenses. The 17-55 is good for it's price, but pointless if you upgrade to full frame in the near future, and the 24-70 II is worth it's money!