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no zoom lens that is less than $3,000 is going to match the edge-to-edge sharpness of Zeiss primes.
Zoom lenses are great for telephoto. But for wide angle, primes win all the way.
Although I am utterly surprised at the IQ of Tokina wide angles for being non-primes. My Tokina 11-16 acts damn near a prime at 11mm.