And whether the sound will not be Boxy LIKE CAN
I assure you, this will not be the case. Congratulations on your newly ordered Z1R. I too grew up listening to Sony, so I know how it feels.
Oh btw, you do need to give it some time before it starts to open up. It took me about 2 weeks of about 3 to 4 hrs a night for it to nicely break in. Right now it's just amazing.