Quote Originally Posted by EricPvpi View Post
I picked up the 24-70/2.8 II recently and have a few days left of my return period. I like the f/2.8, focus speed and IQ. But I also like the range of the 24-105, IS, and 77mm thread. Tough choice if the 24-105 f/4 IS II is going to improve IQ. I just need to decide which side is more important.
24-70/2.8 II is twice the price, without IS, less zoom range. My estimation says the 24-105 II won't have the IQ to dethrone the 24-70/2.8 II if it's half the price with IS and more zoom range. I'd bet it'll be in the neighborhood of the $899 24-70/4IS with respect to IQ.