Side By Side Comparison of Lenovo K4 Note and Lenovo K900. Compare Processor, display, RAM, Storage and other features here. You can quickly compare Lenovo K4 Note and Lenovo K900 smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of Lenovo K4 Note and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.