Upgrade for 17-55 2.8

[Promature]

...losing the 1 stop in appeture didn't really do anything either. What I got in exchange was (in my opinion) a better walk around lens. Also, since upgrading the T2i to the 70D, I can honestly stay that the loss of appeture is a complete non issue now with the better low light performance.

More light is just one reason that a wider aperture is beneficial, and you're right that with current cameras, the high ISO performance compensates effectively in many situations. But, shallower DoF for better subject isolation is another major benefit to a faster lens.

True, true. But, if I want a walk around lens, I would rather have the range than DoF. If I want to do portraits, I use my primes. This of course is just a personal preference. I'm sure people out there want exceptional subject isolation out of their walk around lens.

 

[Loswr]

I'm sure people out there want exceptional subject isolation out of their walk around lens.

Well, I'd call f/2.8 on APS-C more like barely adequate subject isolation, certainly not 'exceptional'.