Erm....no offence meant, but the CU was sold because of the then soon to be released Sp1000. So I'm using my 1Z till then.
So, to be frank, but I still maintain my position of the CU being more resolving than the current 1Z. The only thing the 1Z does better, is drive my dita dynamic better because it has more power than the CU. My dita dream sounded anemic on the CU, something that I found unacceptable. Plus, given that the new flagship was just around the corner at munich, I made the decision to let it go.
In my honest and less than professional view, the 1Z currently still has some way to go before it can catch up to the 380CU in both technical detail and spatial resolution. If only, the CU had a proper amp circuit to power more demanding stuff like the 1Z. On that note, I've never been a fan of AK's amps module system as it hardly seems secure.
I'm only a supporter of superior products, not brands. I have 0 brand loyalty lol.
I'm sorry if that wasn't what you wanted to hear. But, it's an honest, unbiased view having owned both products.