I've got all 5 mugs, and this one is the darkest. Color is noticeably darker than in the picture, it's really hard to read Eskel's name on it, so I hope CDPR will change the color in future. But it's still perfect mug with a nice lid on it. In my opinion, better to get Vesemir's or Lambert's mug if you looking 400ml mug with a lid.
The blue colour is a bit darker than in the picture but the mug is still as good as the other ones.