Skip 16-35 II. Nothing special @ f2.8. I'm thinking 14mm prime, since 95% of my landscape shots @ 16mm.
Thanks ... The 14mm prime crossed my mind too. But from what I've heard you can stitch the TSE's images quite well and make it a panoramic shot ... That said, I wouldn't mind a canon 14-24 which is as good as the 24-70 II.
Once you get used to TS-Es, you'll wish that all your lenses had those movements! But it's manual and you'll have to have a different workflow to get the best out of it. A lot of people have chimed in that it requires a bit more care because of its convex front element, but care should also be taken with water. There are hinges and slots for the movements, and they are not sealed.
Shift is easy to do handheld, but controlling the DOF precisely to throw more of the frame in focus will require live view/tripod. Exposure bracketing and post processing can simulate NDs. Whereas filters put all the work up front, the TS-17 will require less work up front but more at the backend. Yes, some filter setups are starting to come out for these lenses, but I'm not keen on carrying a bag of lenses and then another bag for the larger filters. Some can't be simulated (i.e. polarizer) but some tilt movements can't be simulated in post either. It's a trade off.
I see more of a difference between AF/MF rather than MF and tilt shift. If you don't use the TS functions, then you'll essentially have an awesome non-weather resistant MF lens...