Focus Peaking
K30; M85/2; shot with the aid of LV focusing peaking
The K30 is perhaps at time of writing the only DSLR that has focus peaking from its OEM firmware.
Given Pentax's K-mount backward compatibility (thats over 30yrs of nice legacy lenses), its a nice feature when used with legacy manual focus (MF) lenses.
In use, I found it to be very handy, allowing me to find the area of peaked contrast fast.
Personally, I'm still a bit of an old shooter, so I prefer using a good focusing screen on the optical viewfinder (100% coverage on the K30 btw).
But I do think that I will use the peaking feature more in the future as I have not invested in a dedicated focusing screen on my K30.
Do note that as this is a DSLR, the shutter/mirror mechanism in live view (LV) needs to come down and up again upon shutter release, so there is a split second lag for this to happen.
So for moving subjects, its not ideal, for other stuff, its great.