The denim is fan-fucking-tastic. I've seen how it looks when treated/washed and the blues are unreal. The indigo's blue-black nature, as well as the denim's smoothness, reminds me a bit of a richer version Somet. Aside from that, there really isn't much a comparison in terms of color to 5EP, Flathead, KMW, etc. It's an entirely different flavor. I can't speak for the fit as the sample I shot wasn't my size (who doesn't sample in 32s???) but I believe the basic idea here is to stick to your "usual" size when ordering. For $220 it's hard to compare it to other Japanese brands at the $2-300 level and not see these jeans as a bargain. Yes, I want a pair. You would, too.
Arms- I am trying to follow your questions. MWoC is using different thread gauge to play on the texture of the jean . It will give the jean a more rounded look.
I have called MWoC for a more in depth detailed answer for you.
The weight isn't low but it isn't beefy for sure. Please remember that the first levis where 10oz.
More answers to follow.