Quote:
Originally Posted by Peter Ward
I have the Canon EF Wide-Angle 35mm f/1.4L II USM. Some of the
sharpest camera glass I have ever used.
Not inexpensive, but certainly outperforms my (also excellent) Sigma Art lenses. 
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Is it useable though in the corners at F1.2? That would be a first if it is. Generally fast lenses are poor performers for edge stars.
Basically these lenses are designed for portraits where edge performance is not as important as a lovely background blur. Centre performance is probably great and that's where it ends.
If you are using APSc cameras that would take the pressure off.
Sigma Art lenses promise a lot but apart from one or two they also aren't that great in the corners.
F2 is about as fast as any lens I have heard of that can still be good in the corners. F2.8 to be sure.
The couple that defy that - the Art 40mm and 28mm are monsters and weigh a ton.
Voigtlander APO, Zeiss Loxia are some of the best.
Nikon has a few.
Fuji does not have any really except the 14mm F2.8.
A good nightscape lens is quite a rare animal.
Samyang have a few but they also lack character.
Greg.