It appears to differ only in anti-reflection coating and faster AF speed, 1.8x faster per Canon. It also has manual focus, distance encoding for E-TTL II flash, and a relatively circular diaphragm. It should be available in March for about $2,099.
5-in wide viewing angle TFT LCD with anti-reflection coating - 230,000-dot - Approx 97% vertical x 97% horizontal (record mode) Connectivity - USB - AV out (NTSC / PAL) Print compliance PictBridge, DCF, DPOF, EXIF print Storage ...
The Super Multi Coated (SMC) series have the very best anti-reflection coatings and so will be less likley to lower image contrast.
I suspect that this is due to the lack of an anti-reflection coating on the rear lens element. I think this results in light reflecting off the sensor, onto the rear lens element and back to the sensor.
See also: Image, Sensor, Image Quality, Photography, Exposure
 
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