I set up my Martin DX-1 a while back, and have been playing it in to see how it settles in. I know the neck is wider than on my Yamaha "beater" - but the Martin just doesn't seem as comfortable to play. The action at the nut is a bit stiff, and the tuning over the lower frets isn't very forgiving. A long look at the neck seems to indicate a bit of "neck hump" and the first fret seems a bit high. I think I'm going to have to look at the neck geometry, and check those frets for level.
I picked up this Martin a while back, to upgrade from the Yamaha acoustic which has been my go-to acoustic for so long. The action is pretty high - I don't think it's been set up to get the best out of it yet.