I'm sure that the 5D Mark III and L lenses will see a lot of use for scenics, including sunrises and maybe sunsets, but I think my always have along setup will be the 70D and EF-S 35mm f.2.8 macro IS STM lens. This combination has a focal length equivalent of 56mm, image stabilization and a relatively fast f/2.8 maximum aperture. 56mm, by the way, happens to be the focal length equivalent of the "telephoto" lens on Apple's dual camera iPhones.
Over the past few days I've been using the 70D with both this macro lens and the longer zoom lens. Here are some of the results. The rabbit, if you click on it twice is a full size 100% crop.
|EOS 70D, EF 70-300mm at 300mm, f/6.7, 1/250 sec., ISO 400|
|EOS 70D, EF-S 35mm f/2.8 IS STM, f/5.6, 1/45 sec., ISO 200, 5 file HDR|
|EOS 70D, EF-S 35mm f/2.8 IS STM, f/8, 1/250 sec., ISO 400|