The Hattori FH is the prettiest of the bunch. Whatever Hattori's secret is, he seems to be able to make VG-10 work better than anyone else. The knives are light, thin, extremely well made, easy to sharpen, get extremely sharp, hold an edge well, maintain easily, and don't seem to develop the tenacious burrs some other VG-10s do. Lovely micarta handle, but not as good as comfortable as the Masamoto or the MAC. Very good, but not great profile.
The Masamoto VG has a wonderful, almost Sabatier like profile, is very agile, and feels great on the board. It's a pro's knife without the aesthetic appeal of the Hattori. Quality control isn't as good either. Compared to the MAC, it's decidedly more flexible -- which you may or may not see as a problem. The FH is also flexible.
The MAC is very stiff. It's very much a Japanese made, western-style knife, but because it is so stiff it has the most western feel. Great handle -- the best I've ever held. Blade characteristics are very good across the board -- identical to the Masamotos.
Both the MAC and Masamoto usually (but not always) come sharp out of the box. I've never met one that couldn't be sharpened better than the factory did it -- even before reprofiling. Both knives can be improved with minor thinning especially around the edge, and a new bevel at a more acute angle.
Unusual with Japanese knives, the Hattori is pretty much what it should be right from the factory. That doesn't mean you can't customize it however you want -- just that it will cut onions and only make you cry tears of joy.
My personal aesthetic leans more towards the Masamoto/MAC than the Hattori, although I think the Hattori does have a better blade. It's just a little too pretty. Irrational. But the heart wants what the heart wants, no?