RobertG. said:
Hi,
use the lens you already have for the landscape pictures. The 16-35 is a pretty good lens for this job. More important than the lens is patience and a good composition. Patience is needed to find the right location and wait for good light.
BTW, some grad ND filters and a pol filter are much more helpful in landscape photography than the best lens. Really useful is also a tripod with a ball head and maybe a panorama plate on top. It slows you down but helps a lot to fine tune the composition of your photo.
If you are really serious about landscape photography, get the TS-E 24 L II. It's a great lens and probably the best 24mm lens for a Canon camera available. The difference to the 16-35 is easily noticeable in the corners. But the pol filter, grad nd filters, tripod and ball head are much more useful and should be bought first. The lens alone doesn't make great pictures.
Best regards,
Robert