One Question... I want to Upgrade my lens and actually have the EF-S 17-85mm. Would the 24-70mm f/2.8 Mark 1 be good? Is it worth the money?
I testet both lenses in image quality, build quality and others, but I think that the EF-S is a little bit sharper. Sure, the 24-70 have the lower aperture and so I can shoot better in low light, but the EF-S has image stabilisation... I dont know.
I want to use this lens for Video and Photo, but don't know if this is the best choise for me.
Please help me and give me an advice!
Sounds like you have a crop body therefore you'll lose wide end if you get the 24-70mm but gain at the long end. May or may not be a good thing depending on the type of photography you do.
For a crop body I'd suggest EFs 17-55 f2.8 IS USM - it's constant aperture and very sharp.
IS is not a good feature when shooting video because if you turn it on it both sucks back power and you can hear the IS on the soundtrack.
On a crop body the 17-55 is a good choice, but on FF don't forget about the 24-70F4... it's as sharp as the F2.8 version, a lot lighter, has IS, but is a slower lens... It's worth considering if you shoot outdoors.