That is a tough choice. I have all 3 and they are exceptional lenses. I've thought long and hard about selling one, but can't seem to do it, as they all have their own niche.
The 24 1.4 II gives you AF, a fast aperture, in a relatively compact lens, and it's weather sealed.
The TS-E has next to no distortion, minimal CA, and the awesome tilt & shift movements.
The Zeiss gives you the widest FOV, with knock out contrast, color and detail.
The IQ from all 3 is outstanding. For travel, the Zeiss is the lightest, with the 24 1.4, being just a tad heavier, and the TS-E the biggest. The Zeiss and TS-E take 82mm filters, usually more expensive than the 77mm on the 24 1.4. (if you want to make the decision harder, throw in the Zeiss 25/2, another amazing lens!
Here's one from all 3:
TS-E 24 II (w/shift, two shots handheld)
Zeiss 21mm ZE
24 1.4 II (@ f/1.4)
Thanks for the input! In your experience, do you think the mustache distortion in Zeiss to be significant? I saw some samples in the internet, and got mixed feeling about it. Hypothetically speaking, if you were to only keep 1, which would it be? (I know you had some struggles even selling one, but just for discussion sake..
I also heard that Zeiss 25mm f/2 isn't as good as the 21mm f/2.8.. what do you think?