纸面参数的改进或者阉割，可以看dpreview的机型测评。
我感觉，年代相近的机型，5对焦能干得过1的基本没有，就是感动厂肯挤多少牙膏给5而已。
https://m.dpreview.com/reviews/canon-eos-5d-mark-iv/7
The EOS 5D Mark IV inherits a very similar autofocus system to its big brother, the EOS-1D X Mark II, which is itself very similar to the older 1D X Mark I and 5D Mark III. Compared to those older models, there's greater vertical spread of its 61 points. 41 of these are cross-type, and there's a center point that is sensitive down to -3 EV. The center five points, arranged vertically, are dual cross-type and promise even higher precision with lenses faster than F2.8. One differentiator, though, is that the 1D X II uses a 300k-pixel RGB+IR metering sensor to aid in subject tracking through the viewfinder, while the 5D Mark IV makes do with a sensor that has half that resolution.
1dx在dp上没混上一个review，只有一个语焉不详的overview，惨惨惨。
只能看1dx2的
https://m.dpreview.com/reviews/canon-eos-1d-x-mark-ii/9
With the 1D X Mark II, Canon has revamped its autofocus system. It retains 61 user-selectable points like its predecessor, but they come with a larger vertical spread. Five central points are dual-cross type, offering diagonal cross-sensitivity in addition to traditional cross-sensitivity (both a x sensor and + sensor). The diagonal cross sensors have longer baselines, which means they offer enhanced precision with F2.8 and faster lenses. And they work; with a calibrated lens, these 5 points offer nearly contrast-detect levels of AF precision with fast lenses. The center point is now sensitive down to -3EV.
With the right lenses, all AF points can function at F8, with 27 central points remaining cross-sensitive - particularly relevant to birds-in-flight and wildlife photographers shooting long lenses with teleconverters (there are some restrictions). There's also an updated 360,000 pixel RGB+IR metering sensor that the camera uses in tandem with the AF module in iTR (Intelligent Tracking and Recognition) mode.
【 在 midwest 的大作中提到: 】
: 只看对焦的话，两个都是61个对焦点；5D4是六代处理器，1DX是五代处理器；5D4有触摸对焦，1DX没有；5D4像素3000万，1DX是1800万。
:
: 【 在 surebet 的大作中提到: 】
: ...................
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