I don't think they are directly comparable. Both have very good melee systems, maybe Yakuza's is even more robust. On the other hand, Sleeping Dogs is more open, you have a whole city to travel around, like in GTA, meanwhile Yakuza takes place in only one district IIRC. But that district is quite large, and VERY detailed, and you have so many things to do.how hyped should I be for Yakuza 0 if I'm expecting this to be like Sleeping Dogs?
I would say keep your hype at a managable level, but stay interested, because both games offer great far-eastern atmosphere and combat.