Togiharu is Korin's house label. The G-1 is their VG-10 offering. It used to be a pretty good deal, but since the last price raise or two, not so much. It's not horrible but not great. It's got a reasonably good profile and is reasonably thin. The handle's a little skimpy, and the alloy a little chippy. Fit and finish is tolerable, but nothing to write home about. Overall, it's got nothing going for it the Kagayaki VG-10 doesn't also have, it just costs more.
As long as we're on the subject of Kagayaki, you might want to check the offerings at JCK. Kagayaki is their house label in the same way Togiharu is Korin's. The VG-10 is a pretty nice knife at a pretty good price, while the CarboNext is getting some very hot buzz. There's a knock on the CarboNext though, and that is that JCK does not seem able to ship them anywhere near sharp. That means the onus of "opening the knife" (creating the first real profile and giving the knife it's first real sharpening) falls on the buyer's shoulders. Note that JCK offers "special sharpening," but according to all accounts so far the quality is horrible.
To the extent there is one, Masamoto is THE brand for Japanese culinary professionals. Like all Masamoto gyutos the VG has an exceptional and very Sabatier like profile. The knife is thin without being too thin. Compared to western made knives and the MAC Pro, it's a bit "whippy," a quality many western chefs don't like. But as yo-gyutos go it's somewhere in the middle. There were some F&F issues -- especially with the handle -- in the past; but Masamoto seems to have resolved them in a number of different ways -- including switching from ebony to POM. In any case, if you talk to your retailer before buying he will insure that you get a knife that's right.
In terms of breaking the Masamoto VG down -- you really must compare it to the MAC Pro. MAC has more reliable F&F and a better handle. Masamoto has a better profile and is thinner. MAC is stiffer. Same alloy (at least I think so, neither company will say), same edge qualities with a slight bump to the Masamoto for absolute sharpness potential and a slight nod to the MAC for durability -- the distinctions being products of the slightly different geometry not metallurgy or manufacture. MAC has better product support.
If I were going to buy a stainless, mass-produced, western-handled, gyuto at the MAC/Masamoto price point -- it would be the Masamoto VG for its profile. But most of the people I know would be happier with the MAC.