nac there are alot of difference mainly faster burst rate,faster focus, full time focus in video, electronic viewfinder, ...yes thats all
but people really pay a lot of money for higher bust rate like 6fps in 7D and D300s where sony SLT 57 can do i think 10fps
And full time focus in DSLR is a joke....sony have really implimented it well ....its some phase detection AF I think...sorry dont remember well
Optical viewfinder will be the best but EVF is not far behind with very high resolution display and lot of info on board