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I've seen both these lenses used quite a bit on my workshops. I have the Samyang 14mm but don't actually use it very much.. primarily because I have better options but the heavy vignetting on full frame just doesn't make for attractive shots on the back of the camera so doesn't inspire you to keep using it, even though it can be corrected in post (with a penalty in terms of noise in those areas).
My recommendation would also be for the Tokina. It performs very well across that focal length range wide open at f2.8 so gives you more flexibility. It's easy to focus right on the infinity mark (although the Samyang is not much of an issue either).
The only real reason to consider the Samyang is you want to be more flexible for the upgrade to full frame at a later date, but with your setup now my bid would be for the Tokina.
Phil
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