step up from canon kit lens

[Mr Perceptive]

Canon 16-35mm f4L. Top lens and fairly light. You don't need IS for landscapes. Or Samyang 8mm, 12mm, 14mm 2.8 all manual lenses. Sigma art lenses are very good as well. You could buy second the older Canon 15mm 2.8. Faster lenses means you can do some astro (milky way) night shots, you can still use f4... but it all depends on budget. For me it would be the Canon 16-35mm f4, it's sharper edge to edge and lighter than my 16-35mm 2.8 ii.

On a crop sensor you could also consider the Sigma 18-35mm, not quite as wide, but very sharp (and you get constant F1.8 as a bonus) - not the lightest lens though.