Tegra has always been an overhyped platform, and in fairness, the quad-core Snapdragon's are significantly faster (mostly in benchmarks) than tegra3. I have a S4-based phone, and it feels snappier than my tegra-based tablet, but for the time-being, I think any performance-related feelings that most general users pick up on are almost entirely related to the OS rather than the performance characteristics of the CPU (for comparable CPU's, that is).