I checked the latest issue (January) of Arcadia today, and was very pleased to see that KOF XIII continues to do well. Actually, it looks to be doing pretty great.
It's currently ranked five among fighting games. The top two games are Gundum games (should those even count? :P), followed by Tekken 6 (number 3) and Blazblue (number 4).
What stood out to me though is that KOF XIII's "points" seemed much closer to Blazblue than to the next lowest game (Arcana Hearts 3 at number six). This means that, since release, XIII has been consistently attracting more players. Really great news for SNK, and KOF fans everywhere. Now they need the console version to be an international success!
2002UM was number 7, as I recall.