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The 16-35 is as sharp as the primes assuming it's stopped down to at least 5.6 if not 8. My Zeiss 21mm is sharper at 2.8 than my 16-35 is at 5.6. There is also pretty much zero vignetting at 2.8 on the zeiss on full frame.
The 24-70 is a pile of crap. I've had 3 (long story) and they are all rubbish. I keep meaning to ebay my current one as I never use it.
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