The main reason dSLRs have such fast speeds is because you can use an iso of 12000 with many of them. That is not usually the case with MF. Most of the time, iso 100 to 400 is common and I've never used a speed faster than about 1/250 with my Pentax 645N. While I can use it handheld, it's on a tripod probably 75% of the time. Even the few rolls of 3200 I put through it were shot at speeds slower than 1/125.