Modern 90mm lenses do not have distortion. Distortion means that straight lines will be bowed in or bowed outward. This is not the case with a modern 90mm or even with lenses as short as 23mm.
Do you mena foreshortening? That means that things closer to the lens are reproduced larger then things further away from the lens. Shorter lenses make this more obviouse then longer lenses. This is a matter of physics, not distortion, and is on all lenses regardless of focal length. By looking at the foreshortening you can tell if a shorter or longer lens was used if there is/are objects in the foreground to compare in the shots.
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