Thanks Etienne, the main thing I'm interested in are lowish light performance and sharpness, particularly wide open, same as most people I suppose. I often take a lot of interiors, churches and the like, and this looks like it could do the job, your test shots suggest it will, I'll be using it on a 70D. It's cheap enough to take a chance on but I don't want to have something that I don't use. The 24-105 I have can turn in a creditable performance but I'm hoping the extra stop can provide a bit more, even though one's an L with IS and the other not.