I can only speak for the American MTD's (435 and 535) they have a very unique sound AND feel to them. They can do everything from funk, to mid-heavy bridge Jaco, to a full motown thumping groove.
I would be cautious and say to try one out if you can before you buy. I absolutely LOVE mine, but they're not for everybody.
I wouldn't compare a KZ with a USA MTD. Based on my limited MTD USA experience, this would be like comparing something like an active Korean Squier Jazz to a NYC Sadowsky, AC, Nordy, etc. Mine is a bad example, but you get the picture!

The KXZ with Bart PU and Bart electronics might be a fairly close representation to the sound of a MIA MTD, but the stock KZ electronics/PU? No way. I wouldn't be suprised if I ended up ripping out all of the guts of my KZ6 and replacing them in the future.
Again, for what it is, a KZ is a great bass. But when compared to the much more expensive MIA MTD, Roscoe, Smith, F-Bass, etc... it isn't even close in sound. Just IMO.