Maybe I'm the only one, but the HDR feature looks pretty cool to me and I'm already thinking of ways it can help me with my work.
There are many cameras on the market, pick one you that does what you need.
I don't mind paying the price increase for the added features of the MK lll. Improved AF, frames per second, and silent mode, are by themselves enough to satisfy me. The others are icing on the cake including the new viewfinder.