I don't think Hitachi is a desirable brand at all. Moreover Hitachi service is generally known to be lousy, and a fellow mod in Chennai has experienced the same.if you are brand conscious go for hitachi
Sharp XP13's COP is about 3.63 not 4.0+. Oddly a Korean company has broken the 4.0 COP barrier for 1T ACsboth hitachi and sharp [ both in 4.0 league]