There are no graphical enhancements to any reissued versions of Syberia. However there was a patch for the original 2002 version of the game that prevented a slowdown caused by the game not being made for computers with dual processors or hyperthreading. Playing in compatibility mode got rid of the need for the patch.
Any reissued version of Syberia is already patched, and Syberia 2 never had the problem.
Instead of buying from Steam or Anuman, I'd recommend getting the Syberia games from GOG or DotEMU, which don't have any fussy DRM added onto them.
At GOG the Syberia games are $9.99 each, or $16.98 for both Syberia 1 and 2.http://www.gog.com/gamecard/syberia
At DotEMU, both Syberia games together are $14.99.http://www.dotemu.com/en/download-game/568/syberia-pack