Lenovo zuk z1 is a good phone. It has a good 13 mp rear camera and 8 mp front camera. The camera is pretty nice and shoots descent photos as well as videos. The phone is really well built and looke great from every angle. It features a 2.5 GHZ octa core processor( snapdragon 801) . Ram is 3GB and you will get lillipop put of the box and it is upgradable to marsmallow( android 6.0) . It is a good multimedia phone with amazing looks and features. Also, the battery is long lasting with capacity of 4100 mah. All the snsors are there like GYROSCOPE, ACCELEROMETER, PROXIMITY, COMPASS.
Now here are some CONS:
Lenovo is pretty slow in giving the updates for their device.
However the processor is good in performance and does not lag anywhere but its and old processor and after a few months it may not be able to run the updated games or app smoothly or properly.
Also, no 4k video recording is there
CONCLUSION: Indeed, it is a good phone with nice feature and looks but due to the above mentioned cons it is a little bit costlier and perhaps it is not a perfect deal.