Hi all, I am seeking some advice on my next lens purchase for my Canon 70D. I currently run a kit lens 18-135mm f3/5-f5.6 IS. Well I have been mostly happy with the overall results of the lens I have noticed my buddy who runs a 7D with a Canon EF-S 17-55mm f/2.8 IS USM lens seems to produce noticeably higher quality landscape photos. I mainly shoot landscape/wilderness shots so I was curious as to what everyone recommended for this setting. Also wondering how the f/2.8 lens would do with night photography in comparison to the kit lens that I already have. Should be 2/3 of a stop faster right? I don't plan on doing a ton of it but might take a few shots every now and then, the kit lens seems a tad slow in that department. I noticed Sigma makes a similar lens as well for a little less. Thanks!