I have a Tata Manza and I am a huge fan of the car. So, wanted to check out the Zest as well and find out whether it is better or not.
Found the Zest more compact than the Manza - lesser space inside and in the boot when compared to the Manza but the performance of the car is no less.
It is waiting to take off when you want it to - the sports mode really makes a huge difference in the power output, the interiors are also very nice.
Here is a small video, I made of the interiors when I took the test drive:
https://youtu.be/oJQO3iGBY1g