It helps to keep similar queries in a single thread, rather than having new threads for every query.

If your seat had extra legroom, it would be designated a preferred seat and you would have to pay for the pleasure. You can safely assume that, if KLM are not charging you extra for that seat, there is no extra legroom.

(I don't see how that "extra legroom" remark could possibly make any sense. If curvature of the fuselage is a factor, there is going to be LESS space, not more, as you are still in the same 3-3-3 configuration (used at the widest parts of the plane) at the very back where it's tapering inwards, giving less room).