David, your narrative sounds a bit like you need to reassure yourself that you spent the money the best way.
The Nikon 14-24mm is undoubtfully a great lens, particularly as it has a wider area of usage, being a zoom. If I went to FF, I would consider it (it is even tempting for a system change). However, the Zeiss is IMO better in Zone C from f/5.6 to f/11, except for the vignetting. For a proper comparison, you should have lightened up the image for the crop (or make shots with +1/3 EV bias). Your comment
The 14-24 is pulling incredible definition for a zoom in Zone C, this is completely unexpected and I have to hand it to the 14-24 which appears marginally sharper and full of contrast
is IMO biased, it mixes up sharpness and contrast with brightness.
Another note: in order to achieve "consistent WB values on all shots", you should have shot a grey card and use that as WB, instead of using "Daylight" (who on earth is using "Daylight" etc. in landscaping?). That way you could have eliminated the color difference caused by the lenses.
Nevertheless, your comparison is valuable, thank you for it. What I would have liked to see is how you are focusing not infinity: using a spit screen, or the live view? How reliable is the result?