I was surprised when you made the statement because all along I was under the impression that the DR for digital is on par or even surpass film. Normally, the exposure latitude of colour negative film is about +1.5/-6.5 stops, so that's about 8 stops, which in the case of digital could be easily represented by 9 to 10 bits, since most RAW are about 12-16 bits, it should easily surpass film in terms of dynamic range if not for noise.
not sure about reality but i think for most dslr the latitude is about 5 stops - based on my test with my eos 10d. the exceptions are probably the s2, s3 and s5 which are about twice that of 10d - i think pretty close to negative film.