Hi - I'm looking to get into astro landscapes and am considering the Sigma 14 1.8 or the Sigma 14-24 2.8. I expect most images to be towards the wide end but extra flexibility of the zoom sounds good. I do a lot of landscapes and already have the Canon 11-24, 17 + 24 tse's + 35 1.4ii. Has anyone used both of these lenses and any recommendations based on current lens line up? Many thanks!