1Dx HDR image
Unlike the 5D mk3, the 1Dx doesn't have a built in ability to produce HDR images but, since it has such a high frame rate, it can produce hand held HDR images quite well.
Here is one at ISO 25,600 with 3 images 1.7 stops apart, RAW, processed in LR, no noise reduction and merged in Photoshop:
|Moon 99% D55 C14 St-Zénon 20170806 DP by MarioSS|
from Best Picture of the Week
|Reeds on lake by kkardster|
from Abstracts in Nature
|Florence & the Machine by Dutch Newchurch|
from Second chances..