With the new firmware 1.02.0304, DJI has changed DLog profile. It's now way more interesting. Whites are no more clipped at IRE 75 but at IRE 100 so we can now use histogram and the overexposed indicator to get the exposure right. Let's see in details a comparison of the None, DCinelike and the new DLog profile (all exemple are shot in manual at f/5.6 iso 100 with sharpness/contrast/saturation at -1/0/0)
With correct exposure :
With DCinelike, the histogram is a little higher (we loose some little info in the highlights and win some in the shadows)
With DLog, the histogram is flat, shadows are going even more higher, and highlights don't seem to change
UnderExposed picture :
We see here all the interest of the DLog profile compared to None and DCinelike. Shadows are way higher in the histogram. When looking at the None and DCinelike + 3 ev and comparing them with DLog (with +0 to +1 ev), we can see than we win almost 3 ev in the shadows compared to None and around 2 to 2.5 ev compared to DCinelike. And I don't even talk about the difference in the noise after adding 3 ev to try getting back the small amount of info in the shadows with None and DCinelike (wich is a little better than None in the shadows)
OverExposed picture :
In the highlights, there is less difference. DCinelike loose a little and DLog win almost nothing compared to None.
Conclusion :
DLog profile helps keeping a lot more info than over profiles like None and DCinelike with its flat profile, and the way it saves the shadows higher in the histogram. I would say that DLog has almost 3 stops more information in the shadows than None and around 2 to 2.5 stops more compared to DCinelike. From my point of view, we can even underexpose a little when shooting DLog in order not to burn the highlights and still keeping a lot of info in the shadows
Feel free to comment about all this, I'd like to know your point of view.