Hi Chris,
Whilst I'm a Nikon man, I have used my father-in-law's 12-24mm lens on a cropped sensor. The field of view is fabulous.
One thing to consider is will the lens you plan to buy work on a full frame sensor - thinking of the inevitable body upgrade, whilst keeping the glass. The 12-24mm Nikon lens only works on the cropped sensor. I have an 18-35mm that will work on a full frame sensor, so when I eventually upgrade to a full frame sensor, I'll get roughly the same field of view as he does with the 12-24 on the cropped sensor.
DT
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