Being landlocked in Illinois is hard for the ukulele shopper.
Before I ordered my Mya-Moe, I asked Char and Gordon if they had any instruments in my area. Turned out a guy I knew had two!! So, I got to try them out. I suggest you do the same thing. You may find one or two near you.
As for comparison, there almost isn't any. A good friend of mine is a Kamaka dealer right here in town, and I've played lots of them. They are very good instruments. But, remember the ones Jake Shimabukuro and Kalei Gameao play aren't like the one you have. The Mya-Moe is all hand made and is everything you could expect from such. A very full sound with a wide range of abilities. You can play it hard, or very gently and it will give you what you need. I use it for accompanying and for instrumental solo. It does a great job with jazz, baroque (Bach), Romantic (Liszt), Rock, ballads,.... It gives you crisp clear sound when you need, and melodic lines, but never loses its' robust timbre no matter how quietly you play it. And it will give you lots of sound when you ask it to. The intonation is the best I've experienced. The care taken in every detail from looks to playability is unmatched.
The other thing you get with the personal attention to the construction is the personal attention to your specific needs and wants. The Mya-Moe is truly an extension of its owner.
I'm in Oak Park, just west of Chicago. If you want to come play mine, although it's mango not koa, send me a PM and I'll give you my contact info. You can bring your Kamaka over and play them side by side. We could visit my friend's Kamaka dealership and try the new ones out, too. It would probably be worth the trip. I could even call my buddy from the club. I bet he'd bring his Mya-Moes over. I think one is koa. We'll have a ball!!!