I found comparisons of the original broadcast Negima episodes with the supposedly remastered DVD version.
It is said that the animation company has re-edited some entire episodes of the TV series in the transition to DVD, because as we all know, Negima’s animation quality is like a stock market. Featured here are some links that show side-by-side screencaps of the first few episodes.
http://anime.thenexxus.org/blog/archives/2005/07/negima_dvd_impr.html
http://anime.thenexxus.org/blog/archives/2005/07/negima_dvd_2_im.html
http://www.prototype-blue.com/log2005_06.html
http://www.ne.jp/asahi/kinu/tategamiya/NegiDVD.htm
Seeing these comparisons, I could say that they have really changed a LOT of scenes, and this is entirely great news for me! The girls look a lot more beautiful in these DVD episodes as compared to the original broadcast versions.
I actually watched the DVD versions of episodes 1 through 4, and I can say that not only the girls look better, but the colors (especially their hair colors) are much richer now. Fans will like this, although I wouldn’t know if people would rewatch the series just because of this.
The [Asuna->negima-sakuga-tracker-asuna-version] and [Yue->negima-sakuga-tracker-yue-version] sakuga trackers are updated with some DVD versions, so check them out.