Upload & Sell: Off
I own a 1d mk4 with a few 100k clicks on it. I love that body, if you can pick up a good used one jump on it. That said I also have a 1dx that I have had 6 weeks or so, it has 12k clicks on it already. Since purchasing that my mk4 has been very much a second body now, it has maybe 200 clicks on it since getting the 1dx. The 1dx is pricey but the best of anything cost a lot more than the second best of anything. To me it is worth it, YMMV.