The class size is much smaller - 55 or 65 students, I think. My impression is that fewer students apply to SDM as it is a specialized program, unlike a general MBA, and the acceptance rate may therefore balance out. I don't believe SDM releases such numbers. One important factor to consider is that SDM does not (cannot?) use Sloan career office. This definitely has an impact on recruiting, but you'd have to find out for yourself how good/bad things are for your area/industry.
Thanks for this info. It helps.