Interesting choice of focal length, I'll be curious to see how popular it ends up.
Canon's "affordable" USM Prime line up has included two of the "best bang for your buck" lenses for decades, the 85mm f/1.8 and 100mm f/2.
Obviously at slower aperture than 1.4, but if we compare the two Canons, the 100mm has the same lightning fast and confident AF, similar price, size and weight, and with it's better tamed CA, has better IQ, and gives up so little aperture to the 85mm 1.8 that it's hardly worth mentioning...
..and yet the 85mm has ALWAYS won the popularity contest between the two by orders of magnitude (in sales) which would suggest that when all else is equal, or even when the 100mm is a little better, the 85mm is the one people want.
So will 105mm be able to compete with the 85mm lenses in popularity?
Also, another thing occurs to me, why is a 105mm f/1.4 so heavy and costly when optical light gathering physics would put it almost the same math as a 200mm f/2.8? Wouldn't it? Canon's is only about $850.00 last I looked.

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