From what I've seen (from specs and in the showrooms), the only
difference is that the "Sports" version has more accessories - eg.
spoilers, more sporty interior, etc. The "Sports" name here is
probably used loosely, just for marketing purposes.
There are, however, two versions of Lancers which are true Sports
versions. Then 1.8 turbo....and the all famous Evo models. But they
are much more expensive than the Lancer and Lancer
Sports.