What would you like to know about Konosuke?
Generally, Konosukes are lasers and a lot like other high quality lasers -- but they make a line in a particular, semi-stainless alloy called HD which confers a lot of advantages. Even so, they're hardly unique. Gesshin Ginga, Tadatsuna Inox and Suisun Inox Honyaki all make excellent stainless lasers. If you're willing to venture into "carbon" steel, the prices and competiton change again but the major competitors are Konosuke and Sakai Yusuke.
Bothy Konosuke and Sakai Yusuke make stainless lasers which are a little "softer" than the other knives and as a result have lesser edge taking and holding properties than the other knives. That's not to say they're not good -- they're just not quite as good.
As a sort of generic piece of advice, I wouldn't take a laser on the line until and unless you were very confident of your skills. We can talk about why, if you're seriously thinking of going the laser route -- otherwise take it on faith. On the other hand, if you're thinking of a laser for home use the caveat melts away.
The Masamoto KS is a really wonderful chef's knife. If you're looking for impeccable workmanship and performance, and a very plain, Zen aesthetic -- the KS is as good as it gets. It's also very expensive. And also carbon.
More generally, it would be nice if you could talk about what you want from this knife. If all you want is "good," or even, "substantially better than Global," you can do it and still keep the purchase price far more reasonable than the top of your range indicates you're willing to spend.
It would also be very helpful to know if you want stainless or carbon, wa handles or yo, etc.
After a certain point you're not buying performance so much as exclusivity, aesthetics, collectibility (not that used kitchen knives are really collectible) and other intangibles. The upper part of your price range reflects those qualities.
If you want to get the most ouf of high end knives, you're going to have to learn to sharpen at a much higher level than you do now. That's not a criticism or a warning, it's a "just is." The alternative is to stick with less expensive knives and simple, inexpensive sharpening kit. You can get much better performance than Global for the same money.
Looking forward to continuing the discussion,