Alright so I have a Canon 28 135 that came with my 50D kit. I never used it too much due to it not being wide enough. I just got a Canon 5D mark II with the 24 105 lens though which means it's a much more useful range. My question is this, which should I stick with? I've tried selling the 28 135 and nobody seems to want to buy it for more than $220 when it's like a $350 lens. I'm mainly planning to use the lens for weddings and portrait sessions and so my thought with the 24 105 is that yes I know it's a better lens than 28 135 but I don't want to keep it and then ALSO end up buying the original 24 70. For a walk around lens I kind of like the 28 135 better as it's lighter easier to work with and I pretty much know the 24 105 isn't going to have a wide enough aperture for most wedddings. I think that's what I'm ultimately going to end up with but before I sell the 24 105 for $850 today I thought I'd get some opinions on whether it's really worth keeping the 24 105. Thanks.