the sex mechanic is better in the new version. in the old the change between low, medium and high speed is way to quick. getting medium speed is basically impossible in the old version. besides that i havent noticed any downsides compared to the new version. the issue with the color wheel being blocked by the menu in the character edit also doesnt exist in the old version as the menu is on the other side.
so only the sex system as downside in 2.05h but several upsides
one thing you have to decide for yourself if it is a downside: the outside area of the house that is in 2.11 doesnt exist in 2.05h.you exit directly into the city. so the questline is also shorter.