a prime lens would be the answer(I have a 20mm voigtlander, it seels like 3 stacks of oreos tall!).
sorry if it's outside of your choices maybe i can convince you hahaha
Well, as I wrote in my OP, I already have numerous wide-angle primes, so no convincing is needed! I have a 20, 24, 28, and 35 and every one of them fills a purpose.
The zoom is for cases where I have to haul other stuff (such as when backpacking, when I have to carry tent, stove, gas, food, sleeping bag etc.) or when I want to bring just one or two lenses. The 20/1.8 is not much smaller and lighter than the 18-35, but the latter is more versatile at the expense of the maximum aperture. For normal landscape photography during the day and on a tripod, the zoom allows me to make more shots and also reduces the number of lens changes, which is good when there is a lot of dirt and dust around.
In the past, instead of the 16-35 I have often ended up bringing along the 20+35. Together, they are of course heavier than the zoom, but they are easier to arrange in the bag and when mounted on the camera, they are less bulky.