I’ve handled a bad copy (weak detent) of the 0393, two perfect 0609s, and bought an 0609. Since picking mine up, it has bumped the 0562 as my most carried folder.
My take:
I’ll be honest. If the 0393 had an uncoated blade, I’d have one. I love it in hand, the blade shape is good, and the size is right. Great knife. That blade coating kills it for me.
Even if the 0393 had a clean blade, I’d lean toward the 0609. I’m not a guy who chases light weight knives, or even cares about weight. I *have* had a specific interest lately in blade thickness around .12”, which made me look hard at the 0450 and 0609. Handling them side by side, the 0609 easily for the nod. They’re both great, but the 0609 is a masterpiece. Though the handle is thin, it has enough going on front to back to fill my large hands nicely in a full, four finger grip.
As you can see, the handle provides a perfect grip, without a bunch of dead handle hanging out. It’s exactly as much as it needs to be great in hand.
It also packs a lot of cutting edge for the handle length. Great blade shape, .12” stock, 20CV steel, fairly high grind, perfect sharpening choil, yet still brings the cutting edge close enough to your hand to allow power behind cuts.
This thing is gorgeous. Very easy on the eye. Very good action.
Still, everything about the 0609, except for the pivot tool situation, makes it a very high performing user. I haven’t had to make any adjustments to mine, and I can (literally) walk to KAI if I have a problem, but I don’t anticipate trouble.
I use the 0609 a lot, and it is a genuine pleasure to work with.