Ming-Tzu Offline Upload & Sell: Off
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The general consensus seems to be that the f/4 with IS is your best bet if landscape and still shots are what you're after. For landscapes, you're stopping the lens down anyway so the f/2.8 doesn't help you much. Plus, the IS helps when tripods are not allowed and need to handhold.
From what I've read, the f/2.8 Mark III is better than the f/4 from an IQ perspective, but only if you really need the f/2.8 (e.g. low light event shooting, applications where the corner vignetting isn't all that of a deal breaker, etc.). Also, note that the f/2.8 is heavier than the f/4 in case you're worried about traveling with the lens.
I was in a similar situation when looking to get one of these lenses, and opted for the f/4 because I never used the 16-35 range for my indoor events. I usually have the 24-70, and 24mm is plenty wide enough for me. I am more than happy with the f/4 for its intended purpose.
Sounds like the f/4 is what you need for landscape. Not sure about astro shots though as I've never done that before. Interested in responses though since I'm going to Utah in April and wondering if the f/4 will suffice, and why I might need a faster lens for astro.
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