How do you think the optical quality will be for this? I have the Zeiss 16-35 and the Sony 85mm 1.4. I do a lot of wedding work. (I use other camera systems for the missing focal ranges) Do you think the 24-105 will produce high quality portraits etc for events. Seems like it would be an awesome lens for group shots and family photos... being able to grab head, then torso, then full body pics of all the groups. Any thoughts or sample images yet?