I haven't seen too many winter season series. Other than Demi-Chan, Yowamushi, and Tales of Zestiria.
While Tales is the average JRPG story in animated form; it has a campy story I enjoy and love reminiscent from my childhood days spent on JRPGs. But above all I'm still blown away by Studio #UFOTABLE on the quality of their animation on an animated series.
As a Fate series fan, I'm looking forward to their upcoming Fate / Stay Night – Heaven's Feel movie.