What can't the Olympus OM-D Em5 do as well as a DSLR/SLT camera?

Kim Flowers wrote:

Good to know that it has all the manual capabilities of a DSLR. That was one thing I was unsure about. A couple EM5 owners also commented that the EVF is actually very good with little or no lag, so that's another of my concerns answered. (I live in a beautiful mountain town, but we have no real camera store so I haven't seen the EM5 in person yet.)

The clincher is, I don't only shoot static subjects. Unfortunately, in order to gain quick/tracking AF (i.e. by purchasing an entry/mid level dslr), I may have to give up the IQ and other awesome features of this camera