AO is the same between modes though, and was the same between Pro and Base PS4. I don't think that's the reason, in part because AO in Performance mode (1440p) is different compared to the OG on Pro (1440p), but especially because here sometimes it's absolutely identical to the original on PS4.
By the way, here is a comparison of basically every single little visual "issue" i've found in Prologue, Chapter 1 and Chapter 3. The reason i'm posting Chapter 3 instead of 2 is because of the limit of pictures per post, as i have many shots in the second chapter. I haven't analized every inch of the game of course, but they should provide a sufficient overview.
Very few major things in these first chapters, most of them are uber-anal-nitpick or debatable things, especially in Chapter 1.
The reason i'm posting them anyway is because of the (slim) eventuality some folks from ND see this Thread.
As always, PS4 top, PS5 bottom.
Note: This is a collection of pictures of the same lightning (not multiple ones) and its various phases of intensity across both versions.
Lightnings effects are simply broken in this port. It is not an artistic choice, something's just not properly working here and the same thing occurs through the whole game. You just never properly see a lightning in the Legacy of Thieves release.
And the few missing mist layers don't help either, especially in motion.
Lens flare effects like this one are cheaper looking in the Remaster. It's really hard to portay in pictures, but they are more suble and sophisticated in the original, while almost annoying in the Remaster.
This is constant through the whole sequence. It could be an artistic choice, and it probably is, but i can't really say i'm a fan of.
This entire Chapter features very minor differences, and most of them are debatable. Nothing major worthy of note here, so my advice is to simply not open the Spoiler unless you're a maniac or a ND employee.
They changed Nate's expression during this sequence, and needless to say i prefer the original. His face in the OG expresses both sadness and anger, while there's only anger on display in the Remaster. But it's debatable.
There's a weird issue going on at the top of the lamp, absent in the original. AO/shading is also worse looking to me, especially on the phone, and on the bronze part of the lamp with less realistic highlights on the bottom (not seen here).
In general, for the most part of this area AO and shading don't look as good as they did before to me.
Like here for example.
The smoke coming from the chimney looks less volumetric in the Remaster. Hard to portray in pictures though.
In the Original Release they decided to make these particular trees darker to accentuate the scary feeling of this jump. It made sense, being them occluded by the buildings, and made the sequence more impactful.
What's curious is that they made the tree in the immediate next shot darker than the Original.
Moonlight highlights on the bulding surfaces are toned down here. I prefer the OG, as it blends perfectly with highlights on leaves of distant trees, and ultimately makes for a more atmospheric shot.
There are also ugly looking spots like these in the Remaster which could have been improved.
There are significantly less fish in the Remaster in this openining shot, and it's possible they altered/toned down their AI as they act downright weird and some even clip with the camera. This never happened in the original.
As also seen in OP, the GI bounce lighting is toned down in this whole sequence. It's hard to spot in pictures, but i personally really hate this change (which is much more noticeable in motion), as the sequence looked simply mindblowing in the OG thanks to this incredible tech.
Wet shaders on Nate suit have been toned down a bit for this scene.
Note that in the immediate previous shot he looked super wet in both Remaster and OG. The suit also slowly dried during gameplay in the OG.
As better seen in OP, reflections on water are toned down/downright missing in the Remaster.
An uber-nitpick kind of of find is that in this last shot the yellow tree in the background is slightly better shaded in the original.
Bloom is toned down on this yellow can in the Remaster. This is probably due to the fact they imperceptibly altered shaders on said can as later seen in the game, however i prefer the way the original shot looked. Just like i prefer the way whatever-that-thing-by-the-door-is was shaded in the original.
As i said, very few major things in these first Chapters. That's not always the case with the next ones though.
P.S. Genuine apologies to anyone triggered by the batshit crazy levels of OCD on display here.
I assume some details got missed in the conversion over to the new API. I assume they didn't really compare their work and just assumed everything looked "alright"
this is sadly almost always the case, be it movie remasters of game remasters. details like that often only get found after release by dedicated fans