The difference can be pretty staggering between games even released a short time apart. I recently got back into AC games, and while downloading them I noticed Origins is less than 25 Gb, while Odyssey is over 75 Gb. They were only released one year apart.

I havent started Odyssey, so I cant make a comparison, but Origins is a beautiful and well running game at less than 25 Gb of data. I cant imagine Odyssey is significantly more impressive to a point where demanding 3x the data is justified. But I guess I will see soon enough