Side By Side Comparison of ZTE Blade L and Zen Ultrafone 504. Compare Processor, display, RAM, Storage and other features here. You can quickly compare ZTE Blade L and Zen Ultrafone 504 smartphones just by looking at their ratings and results showing "winner" and "runner up." There is also a short analysis comparing different features of ZTE Blade L and . You can also look at each hardware feature individually to perform your analysis while comparing mobile phones.