comparison of Lava E Tab Z7S and Lenovo Tab A7-40. Compare Processor, display, RAM, Storage and other features here. You can quickly compare Lava E Tab Z7S and Lenovo Tab A7-40 smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of Lava E Tab Z7S and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.