I am getting my camera (5d3) replaced and have the opportunity to sell the replacement and get factory refurbed 1d x for $3900 or spend $1600 more to have 2 5d3's so I will have a backup. Just not sure if I should jump on the 1d x since I have lived this long with 1 body or get the 2 5d3's. My main want is stop better iso performance, customizable ae adjustments, more accurate metering. Just looking for people who have both to give some insight. I do like the smaller size, silent shutter, lower weight but want a tool thats best for the job. So far events and portraits are all I have done. Also landscapes and macro.
There are lots of threads here and elsewhere on this.
What I have found, of importance to me, is this:
At/below 1600 ISO, 5D3 = 1DX. Above 1600 ISO, 1DX > 5D3
Metering: 1DX > 5D3
f/2.8 AF Points: 1DX > 5D3
Viewfinder face detection: 1DX
Numerous comments about the superior quality of 1DX files and the ability to manipulate them in post.
At low ISO's, given a properly executed image, the 5D3 seems to have more detail due to more MP.
The quieter shutter (not even in silent mode) of the 5D3 should not be underestimated for things like weddings. This comes up again and again.
Not an easy choice. It isn't just build quality.