Yeah, this DOES sound too good to be true. It looks like a 5D Mark III for half the price. I don't see a reason why Canon would do that. I just hope I'm wrong, though.
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Did you try these: CN-E24mm T1.5 L F, CN-E50mm T1.3 L F, CN-E85mm T1.3 L F ?
I haven't tried them, but from the notes they seem to be fair good for filmmaking...
They say: "Perfect on the EOS C300, these lenses are also compatible with all Canon EOS DSLRs.", so it seems legit.