zooms vs primes for landscape

[tron]

Is Coma performance particularly important for landscapes? Wide open, how about at f11?

You got your answer already. If you had noticed I had mentioned astrophotography not landscapes in general...

I just got the Zeiss 21mm last week and took it with me to Moab to break it in. For an astrophotography landscape lens, I must say it is spectacular:

YES! it is exceptional for sharpness across the frame, low coma and hard stop at infinity

 

[Rienzphotoz]

I have the Zeiss 21mm too and I quite like it, especially for astrophotography (not much coma and hard stop at infinity). Now even "modern" Canon lenses exhibit coma like: 24mm 1.4L II 35mm 1.4L 16-35mm f/2.8L

I guessing that Canon's coma performance will be improved during the next round of release. The 24-70 II is much better coma-wise.

Is Coma performance particularly important for landscapes? Wide open, how about at f11?

Only for astrophotography. You don't want to stop down to f/11 as your photo will change from a 15-30 second photo at 2.8 to a 4-8 minute photo, and those bugger stars just don't hold still. I just got the Zeiss 21mm last week and took it with me to Moab to break it in. For an astrophotography landscape lens, I must say it is spectacular:


Moonlit Bridge by yorgasor, on Flickr
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MAGNIFICENT! ... all you prime lens guys are tempting me into getting these awesome wide angle prime lenses for my Sony a7