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Wow, I would not expect soft corners, lots of vignetting, and lots of barrel distortion on a new $900(!) prime lens! This is disappointing IMO.
And why are these non-L lenses $900 anyway? (I have had great experiences with the old $250 35 2.0. I would stick with that...)
First, they are not $900. Canon introduced two primes (24 and 28) at $800 and $850, but they are currently about $630 to 650. So this new 35mm, introduced at $850, will likely also be $650 after a few months.
Second, the corners are not "soft". As with nearly all lenses, the corners are softer than the center wide open.
Third, it doesn't have "lots" of vignetting. It has a completely normal amount when wide open. Stop down one stop and it's largely gone.
Fourth, it doesn't have "lots" of distortion.
And unlike the old 35/2, it will have quiet autofocus, 4-stop image stabilization, a rounded aperture, aspherical glass, better build quality, and better corner performance. If you had great experiences with the old 35/2, you would have greater experiences with the new one. If you find better 24, 28 or 35mm autofocus primes at $650, buy them!