Hmmm....I have only had a cursory look/blow at one 62III...it seemed pretty nice. But granted I didn't have an older one next to me at the time.@Stephen Howard will tell you that the Yam 62 is not the Yam 62 of yesteryear. Used to be their flagship, but obviously now isn't and it seems that they've 'downgraded it'.
Steve doesn't seem to rate the Mauriat build quality too highly either - but rather than take my word for his - horses mouth Steve?
I have all the respect for Stephen. With that said, my experiences also disagree with some of his bench reviews of certain models, FWIW (although I would say they are one of the more concise and helpful internet sources much of the time).