Suit Supply says its shorter because its supposed to be a more casual type of a SC (its unpadded with no lining and it is 48% cotton and 42% wool and 10% poly) for a thicker feel thats more casual. So the general census is that its too short? All the blogs/menswear sites all say shorter jackets are better now but I don't know how short is too short.
I wouldn't say its that short. Looks pretty good to me :)