I am back to clear things up a bit
First of all my System specs are:
i7 2600K @ stock speed
8GB DDR3 HyperX memory
GTX 760 DC2OC 2GB by ASUS
WD Black 7200RPM HDD (game and UPlay are installed here not on my system SSD)
Next these are my in-game settings:
And i am using latest ReShade with LumaSharpen option enabled and set to 2 (i am still tweaking things so this will probably change). I also locked FPS to 30 with ASUS GPUTweak (no additional overclocking). I am getting 30FPS 95% of time (only drops i get are during carriage riding and FPS drops to 27 FPS max). I also get really big FPS drop during cutscenes for a few seconds but that doesn't impact gameplay and that is important
Also i didn't mess up screenshots order (i know because screens are time stamped and i know when i took each screen

).
Here i took new set of screens:
900p upscaled to 1080p:
900p upscaled to 1080p with ReShade:
1080p without ReShade:
I need to note that every time i change resolution ReShade "restarts" so some artifacts could be possible.
Also here you can see 1080p with and without ReShade
1080p:
1080p with ReShade: