Has anyone tried out the Minolta AF D 24-105mm f/3.5-4.5 on the 7D? I'm trying to decide on which lens to get with my lens rebate once it arrives. I've narrowed it down to the 24-105mm or the new 28- 75mm (D). This will pretty much turn into the primary lens for the camera, to minimize the dust risk (reduce need for lens changes), but want to maintain as high of quality in the pictures as possible. Reviews and ratings on these two lenses seem to be pretty limited. One is too new, so not much on it yet, but can hope that it's similar in quality to the G lens. The only thing I could really find on the 24-105mm is that it has some vignetting and distortion at the low end. But what I'm really wondering is if this is a factor at all on the smaller APS-C sized sensor??? Also, since it's only F/3.5 compared to F/2.8, is that a significant enough factor??? At least from a Specs perspective, the 24-105 is ahead in factor of range (24 vs 28 & 105 vs 75), weight (395g vs 510g), size (69cm vs 94cm) & price (by ~$70), where-as the 28-75 D wins with better F- Stop (F/2.8 vs F/3.5), and min-focus distance (33cm vs 50cm), otherwise they seem to be pretty equal. But when it really boils down to it the key factor is quality of the shot? Thanks for any feedback!