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