I've been using Sorby chisels for the past few years but have never been 100% satisfied, find them bulky, looking for new set. What about these Japanese ones I see, where can I get a set of those?Not adverse to buying used ones. Anyone ?

I am not in the business of selling chisels but you can find excellent Japanese type chisels (and the elegant US hand made ones also) by searching the various glossy publications regarding woodworking. Which Sorbys are you using?
Used chisels are going to take more time to get into shape than new ones unless you get lucky.