Agreed, I've been uhhhming and ahhhing for some time about which one of the new primes to get for my 7D as a walkaround lens, the 35 IS appeals to me because it's 2 stops faster than my f4 lenses, but it's fractionally longer than a 50mm on full frame, the 28 is just slightly wider than a full frame standard lens and the 24 is closest to the 40 pancake, but both the 24 and 28 are only f2.8. I like the thought of a slightly wider than standard compact stabilised walkaround lens, and the 24 comes closest...... but the 35 is faster..... decisions, decisions .... Still, the longer I wait the more they come down in price!
New sigma 30 1.4 is supposed to be available March 31st. Granted, it's a little more expensive than some- I think $599? but that's less than canon's new IS primes, and it promises to be as great as the sigma 35. It's a crop-sensor only lens, which is the tradeoff for small/light/inexpensive.