I am moving over from Nikon - I think Sony now sits well for me as a landscape photographer.
I have been a bit dissapointed with Nikons wide lens selection. Used a 17-35 for a few years but know it is not the best. Tried a used 16-35 F4 and it was worse than the 17-35. Ended up having to get work done on it by Nikon and even then it was not as good as the 17-35.
The 14-24 is apparently great but I like to use grads and decided not to upgrade to the 150mm I would have needed. Cost alone for the 150mm Firecrest grads and NDs was crazy (still cheaper than a new system though

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Canon glass is very good, but their sensors are playing catchup.
So - time to give the GMasters a try