Well I know it may be a little apple to oranges here, but wanted to know if anyone had any direct experience with both of these lenses. I am doing alot of traveling lately and am a little tired of lugging my 24-70, Sigma 10-20, 85 1.4 and Sigma 150. Looking at "downsizing" the 24-70 not only for weight while traveling but also for a little piece of mind when doing street shooting. I have tried the 17-55, but am still looking for something that doesn't scream $1000. Mostly it'll be used for pix of my kids doing kid things, casual street shots and ????? I've been spoiled by the 24-70 and my 18-200 is just continually disappointing me (misfocuses, drab color, etc.). BTW, I'm shooting a D300. Any thoughts?