The 055 looks to be about the cross the wake of the container ship, so the aspect angle of the container ship and the 055 would be significantly different. I would estimate the camera is roughly 30 degrees forward of the beam of the 055, but 60 degrees abaft the beam of the container ship. The difference in aspect angle distorts the relative apparent length of the containers to the apparent length of the 055’s fore deck. So it is useless for range assessment. A better measure is the height the railings on the deck of the two ships. It would appear the container ship is roughly 1.25 times further from the camera than the 055.