Help me choose a wide prime!

[BokChoiTV]

Hai guys!
So I'm looking to get a wide prime.
Has to be less than 50mm, faster than 3.5, and well, good optically, lol.
Lenses I'm looking at:
Canon-
24mm 2.8 IS USM
35mm 2.0 IS USM
20mm 2.8 USM
28mm 2.8 IS USM

Hoping to stay Canon due to some "discounts" I can get.
Price isn't that big of a obstacle, but the less the merrier, lol.
Any reviews on these?
Sharpness is nice, but I worry more about chromatic aberration. I hate CM in photos .
Also, I'm doing mainly video, but shoot pictures every now and then.
Again, sharpness would be nice, but I'm using the wide angle primarily for video work.

 

[Mt Spokane Photography]

Photozone is one of the places to check, since they measure CA's.

The new Canon IS wide primes are designed with video in mind, and have low CA's.

So far, they only have results for the 28mm lens, but the others likely use the same optical formula and should be the same,
http://www.photozone.de/canon_eos_ff/774-canon28f28isff?start=1

 

[RLPhoto]

For the $$$, the Sigma 35mm 1.4 is what I would buy or the 24LII.

 

[marcel]

I use the the EF16-35 2.8L mk ll mainly for video. And for "bokeh" sometimes the EF28 1.8.