AI gigapixel have been updated and the result are even better than before
edit: with more tries, I choose to keep the previous version. the new version is more faithful to the original texture, but the old one was sometime more efficient to create new elements to very low quality texture.
The texture obtained with the new version of AI gigapixel are better quality but they have a cartoon look.
The new version is really made to enhanced pictures and drawing, not low quality texture.
however, I think that for character face, the new version is better(as face texture in FFXI are not realistic)
here is a comparaison of the result before (V3) and after(V4)