DW8+XL came in today. Only had time to mess around and play a few levels. Lu Bu's daughter is pretty fun to play as. That crazy cross weapon is back! Gonna try the new Lu Bu storyline route but then focus mainly on the new XL stuff in this port I think. Although you have to go through the story modes to unlock levels, I like that all of the characters are available right off the bat to use in the other modes. Speaking of which, Challenge Mode has been added.
The Vita version looks a bit better than some of the other Koei ports. Definitely better than Warriors Orochi 3 Ultimate, for example, but unfortunately it suffers from some pretty bad framerate drops. The console version has this problem too, but it's noticeably worse on Vita. Still completely playable (it's a musou game- nothing particularly precise is needed here), but the other Koei Vita musou games perform better in comparison. Maybe a patch will fix things up. For now I'd definitely recommend getting this on PS3 or PS4 instead.
Some pics of the Vita port. As always, Vita captures look shittier than the real thing.
For comparison, here's WO3U:
And One Piece Kaizoku Musou 2:
One Piece is Koei's best port to the Vita, IMO. It may be more simplistic visually, but it looks the best.