crispy12
Well-known
I just faced this question myself. Semi-pro, have a day job, not a dentist.
My original 5D is on its last legs, hotshoe starting to fail, etc. I was weighing a 5DmkIII vs spending that $3K on X-system and lenses. For me it's a serious outlay.
My own photography for fun is an old beater M2 and a Rolleiflex. I love the idea of the X series and am sorely tempted. My semi-pro work involves corporate events, portraits, and concert photography. And I have a good set of lenses and Canon flashes that serve me well.
In the end, the extreme ISO of the MkIII was too much to pass up this time around -- that and I love my 15mm fisheye on full frame for concert stuff. I also feel like I know EOS so well right now that it's an unconscious competence. The transition would likely involve some unforeseen hiccups.
But, I am fairly certain that it will be the last DSLR I ever buy.
For slightly over $1k more, you can get a used M9 or brand new M-E, and use your m lenses too. That's what I did and have never looked back. Even my film M is upset, as I haven't used her in the last two months.