6D + 17TSE vs D800 + 14-24 + PS6 pc

check out the http://www.16-9.net/

http://www.16-9.net/lens_tests/canon14l2_nikon1424/nikon1424_canon14l2_a.html

http://www.16-9.net/lens_tests/nikon_14_24mm_1/nikon14_24mm_a.html

it´s the same 1DS  mk3 camera they use with both lenses so it says all about the performance of the nikon lens and looking at the corners in the test vs the canon 14 mm prime there is no softness like the Jogger´s samples are showing .

6D + 17ts and you have a great setup for the type of photography you are trying to do, and a D600 with 14-24 gets you a cheaper solution with better flexibility .or you can use d800 +14-24 and crop the corners if softness bothers and still get a reasonably big file to get it all in one shot.

anyway,  the 17 mm TS is better than the Nikon TS options available.nikon TS lenses are not that good as the canons newer TS lenses.