As a long time Pentax user (K3 and K1 currently, lots of lenses, DA*300 the longest though + a 1.4TC) I've been mulling over a D500 or OM-1D. Am I mad? K3III on offer at the moment seems tempting but the buffer is tiny! This is a problem for me when I shoot trains, as a few burst during a run past soon fill up a buffer. I'd appreciate your thoughts Mike. I recently went to a photo day at the Hawk Conservancy, quite a frustrating experience, but a few actually in focus! (see FlickR ArleImages for results)