Lenovo zuk z1 has a old processor.it uses snapdragon 801 chipset which is a old chipset but it is still good as it is clocked at 2.5 ghz.
The sound quality on lemovo zuk z1 is very good via earphones but on its own speakers which are located in bottom are not upto that good quality. Its speakers are low in voice.
Its user friendly phone.but this phone is best for those who like to use custom roms on their device.
I like the design and look of the device.but the plastic body at the back feels cheaper.
As zuk z1 comes with cynogen os.it has plenty of customisations in it.
Camera quality is very very good on this phone perfect for potography.
Value for money is average with this phone.