To my eyes NO EA gives a much brighter look or less muddy is the best way to describe it during the day. The clouds change and become more defined and cirrus is now visible which it is not with EA on. Note the change in the colourisation of the sky as well. A light washed out blue with EA on and a darker shade blue with NO EA. The effect in the cockpit seems to be the same brighter and more clear with EA off and darker and muddier with EA on.
At dusk the change in the background is more remarkable, same time different lighting effect results. The cloud colourisation went from a yellow to a pink and the overall light or visibility picked up considerably with no EA- absolutely no change to the time setting between the two. The EA on is very dark by comparison. The other thing is with EA on there are no stars becoming visible in the sky whereas with EA off they now appear as you would expect at this time of day.
If you look at the same time shots from the cockpit you will see that distinctive yellow sky with EA on and note the overall field visibility is reduced, there is cirrus there but it is hard to tell if it is because it just looks like more cumulus cloud. The EA off shot you now get a pinker look, the cirrus is clear and the cloud shapes and shadowing is now more distinct as well. I also noted with EA off you get more sunlight reflection off the buildings and trees which is natural but with EA on you do not it is just dark apart from the visible lighting which does not change for either setting. Overall with EA on it gives the impression of being about half an hour later in the day yet the time setting was not changed between the two. There is definitely an angular difference to the way light and shadow is being shown on screen.
Now these are probably REX's cloud models coming into play here as well but the issue is that the cloud now has a more natural appearance and most importantly is darker on the bottom of the cloud and lighter at the top which is the way it should look in real life. The EA cloud forms are more patchy, less distinct in shape and noticeably fewer by cloud amount yet there was no change to the loaded weather setting, light cloud and fair weather.
What does it all mean? I am not sure given the improved light factor with EA off that EA is all that it is cracked up to be it makes everything look muddy or dirtier and you can see the overall ambience changes on the models as a result. I guess one has to choose which one prefers and at the moment it seems EA off in the go!
This is all done with an NVIDIA card and a HDR monitor. I guess if people wonder what is the difference this seems to illustrate it. Anyway as a long time ABC TV show presenter used to like to say - 'That's your blooming lot for today".